There is a surfeit of motor racing championships that aim to usher in the next generation of Formula 1 stars. But only a few are worth paying serious attention to.

GP2 — the ‘official’ way to progress to F1

The most well-known by a long way is GP2. Backed by Bernie Ecclestone, GP2 is the closest thing there is to an ‘official’ feeder series to the pinnacle of motorsport.

Since its inception in 2005, GP2 has been a stepping stone for some of F1′s biggest names. With a solid F1-style car and a unique status as the support race to almost every European grand prix (thereby giving drivers vital experience at many F1 circuits), there is no doubt that GP2 is a strong category.

The main alternative: World Series by Renault

But beyond the ‘official’ routes to F1, World Series by Renault (sometimes known as Formula Renault 3.5) has established itself as a series to take seriously.

No fewer than 18 F1 drivers have raced in World Series by Renault or one of its earlier incarnations. Among them are Robert Kubica, Heikki Kovalainen and Kamui Kobayashi. In 1999, World Champion Fernando Alonso also won what was then the Euro Open by Nissan series.

Most impressively, in 2007 Sebastian Vettel was leading the championship when he became an F1 driver mid-season. We all know how that story ends.

Strong drivers in World Series by Renault

This year’s World Series by Renault field has some very strong drivers in the field. Two of the favourites for the championship, Daniel Ricciardo and Robert Wickens, are currently already F1 test drivers, for Toro Rosso and Virgin respectively. These drivers are so hotly tipped that both have been rumoured to become race drivers before this season is even finished. I will certainly eat my hat if they are not racing in F1 in 2012.

The pair put on a wet weather masterclass in Race 1 at the Nürburgring two weekends ago. In changeable conditions, they had the measure of the rest of the field while engaging in a tense battle for the lead.

The talent doesn’t end there. Other current F1 test drivers participating in World Series by Renault include Fairuz Fauzy and Jan Charouz (both for Renault F1).

Meanwhile, Jean-Eric Vergne is next in the queue behind Daniel Ricciardo in the Red Bull Young Driver sausage factory, and rightly so. His performances at Spa-Francorchamps were at times jaw-dropping.

Young Estonian Kevin Korjus (Race 2 winner at the Nürburgring) has also turned heads in his rookie World Series by Renault season.

Scrappy driving in GP2

When you compare it with this year’s GP2 field, the ‘official’ feeder series seems to lack that edge slightly. No driver has managed to take full control of the championship — nor has anyone shown signs that they deserve to.

Romain Grosjean has come the closest. But you could argue that he ought to be. He is highly experienced compared to most of his competitors, and even has some F1 races under his belt. He is this year’s Giorgio Pantano. He has been involved in some questionable incidents. He managed to crash into his teammate at Barcelona. As if that wasn’t bad enough, he then climbed all over him as part of the truly farcical scenes in the qualifying session at Monaco.

Meanwhile, the hotly-tipped Jules Bianchi (who is a Ferrari test driver) has been surprisingly clumsy, lurching from needless crash to avoidable gaffe. After a promising (albiet curtailed) GP2 Asia campaign last winter, Bianchi currently languishes in 15th in the championship, having managed to score points in just two of the eight races so far.

Giedo van der Garde has arguably been the most consistent, but still manages to make needless errors. In Valencia, he was penalised for overtaking under yellow flags.

Beyond this, it is difficult to see where the F1 stars of the future are in this year’s GP2 field.

A good alternative for both viewers and drivers

Moreover, the World Series by Renault season has been more action-packed for my money. This season’s calendar visits seven current Formula 1 venues, including some of the best circuits in the world. Spa, Monza, Silverstone and even Monaco all have slots in World Series by Renault. The calendar is refreshingly light on Tilke designs.

The Formula Renault 3.5 cars themselves are impressive, providing an ideal bridge between the well-established Formula Renault 2.0 cars. They typically run just a few seconds a lap slower than GP2 cars.

From next season, the car will step up a gear with a more powerful engine and greater downforce. But most eye-catching is the introduction DRS-style moveable aerodynamics. It could well be that the new Formula Renault 3.5 cars will prepare drivers for F1 better than a GP2 car can.

The combination of superb F1-style cars, excellent circuits and promising drivers is creating great entertainment. For me, it is the feeder series to watch.