Either one might make you slower, depending on how you appreciate money. I've only ever done two track days in turbo clios and i only drove it probably 50% of what they are capable of.
Mechanical sympathy is a big thing when it comes to tuned clios (itb & fi) if you want any type of longevity.
Im at brands hatch a lot, as i live about 7 minutes away from there, and i can tell you from all my experience of being there, the fastest 1*2's ive ever seen are completely standard, bar an exhaust and stripping and ive seen 3 or 4 turbocharged ones on more than one occasion there, itb'd ones and even one supercharged one.
Infact, besides public trackdays, the fastest 182s ive seen are the ones that compete in the 750mc clio 182 championship which are capable of high 56s laps of the indy circuit, and they are standard weight clio 182 cups!
My point is attitude and commitment are the main factors, having been there alot im 100% certain i could do better lap times in a standard clio 1*2 that i could buy for cheap, and if i done more trackdays this is definately a route i would go down, find some cat d 172 cup for a thousand notes and have less worry about reliability and crashing it, with this mentality you can push harder and potentially have more worry free fun on your track days.
Technically speaking however, theres a reason why for most motorsports FI & NA are not allowed to compete together, they are in different leagues, for the most part naturally aspirated cant compete with turbocharged cars, infact forced induction makes NA redundant in many ways.
This is more aimed at all cars not just clios but in terms of performance theres only few reasons why you would choose NA over FI tuning route, either you are a true diehard NA fanboy (of which i kinda am would you believe it
) infact if money were no object, id love to build a n/a honda s2k, amuse, Js racing and spoon all do bolt ons that can build you a 330bhp+ n/a s2k which i can only imagine is unreal!
Or, you are building a competitive car that is restrained by rules allowing N/A only.
N/A tuning unless for the reasons above is also financially nonviable, certainly in the s2ks case as any 300bhp build is going to cost upwards of £15k whereas you could turbocharge or supercharge it for a lot less and have a lot more capable machine, which is the same story in most cases of n/a tuning versus FI tuning.
As per above, it doesn't really matter if driver ''a'' can keep on the heels of driver ''b'' in their n/a versus the FI , thats just the skill and the commitment of the driver showing, the FI car is always going to have the potential of being a better performing car.
Id love to see some feedback even if your opinion differs from the above, as i genuinely love talking about this kinda stuff so long as its discussion rather than argument of course
and of course if you are interested in reading the life story post i just made