Board Thread:Game Discussion/@comment-26808586-20150807120954/@comment-26793627-20150807212354

ME7 has done a pretty thorough job of answering your query. I just have a slightly different take on the matter.

First things first. Don't buy the RSR 2015 if the purchase decision is an either-this-or-that situation. RSR 2015 certainly has better PR (82.4) and specs than its predecessors when maxed out with R$ upgrades (16/27), but it's useless in the Masters of speed series( it allows you to play only one extra cup race within the same 18th tier, with a PR requirement of 82.0, compared to the other RSR's, and has no net usefulness in progressing within the series) and is almost useless in the Racing Spirit series, unless you manage to slow down the bots early on, or else you'll have a hard time catching up the bots driving the AM Vantage GTE. You'll be forced to buy the Aston Martin quite early too, as the Renault is simply not up to the task. Renault R.S. 01 is a R$ purchase alright (it costs R$ 2.1mil, fyi) but you'll exhaust its R$-only upgrades pretty soon at PR 74.6 (11/29) leaving you high and dry at the 8th tier. Since the AM is included in both the series where the RSR 2015 features, I figure you will be better off buying that instead, as there is a difference of only 50 in their price (lesser with discount). Mind you, upgrades of the AM aren't cheap either and will cost you around 500 if you wish to race the last cup race in both series. In contrast, the Renault will cost you over 700 to reach there in the only series it features in.

Both RSR 2013 & 2014 have identical PR (81.7) when maxed out with R$ upgrades (16/27). At this point, they also have the same figures of 0-60 mph: 2.38s and downforce: 1.77g. 2014 RSR boasts of marginally better braking power and a not-so-marginal top speed difference. They both feature in 4 series, having 3 of those in common. RSR 2013 features alone in Porsche: 50 years of 911, where it is the boss by a huge margin (PR requirement of last cup race is only 61) and RSR 2014 features alone in Speed Demons, where it's pretty much useless. Also, to complete 100% in either of these series, you need more gold purchases ( GT 2 worth 120 if you go with RSR 2013 vs Agera R worth 800  + Zonda R worth 400  if you choose RSR 2014 ). Getting 75% of their respective unique series is easier with RSR 2013 without spending any gold on cars/upgrades than with RSR 2014. In the 3 series where they feature together, there is not much to choose one over the other and in the only career series, Vertex series, which matters towards game progression, both are utterly useless and you'll have to rely on the McLaren to get through.

So, if I were to choose, I'd choose the RSR 2013. The fact that it's cheaper by 50 (40, after the 20% showcase discount) just sweetens the deal that much more :)

PS: I've all the three RSR's and I wish I hadn't. Like I said before, they are utterly useless unless you aim to achieve 100% in the series they feature in.