It depends what you want to use the car for and how much you want to spend.
A decent mk1 frs is 10k + now compared to a mk2 frs which is more than double the price.
The mk1 can be used for daily duties as I know a few people who use there's everyday and are running 300+ bhp. On normal driving it drives similar to a normal focus apart from the suspension being harder.
The mk2 is a more capable car but it is 6 years newer. It's unfair to compare them but if I was buying a car to keep nice and use occasionally I would much rather have a mk1 frs it's a wee bit more exclusive as there were only 4501 ever made which a fair few have died so that boards well for future prices.
Example I bought my mk1 frs 4 years ago with 44k miles on it which was a totally standard car I paid 7.5k for it.
Upgraded a few minor bits and pieces but still standard power, fixed a bit of paint.
I sold it this year for 9.5k with 55 k on it.
Look at the prices they are only going up.
For once dojj is talking sense ( I feel like I'm in an alternate reality)