AFAIK, statistically, the Leon is more reliable than the golf - the platform on which it is based. A bit odd - maybe chassis/engine aside it's a bit more basically built otherwise in terms of electrics etc?
This happens - a Mazda 3 is 'basically a Focus' too - but again, it's a fair bit more reliable.
Anyway, FWIW, I think Leons are a great car - the older model was very good and if anything the 'new' one is better - it certainly looks the business IMO. Great to drive. I'd take one over a Golf any day for a few reasons - not least cost.
The engine variants will be similar to the Golf I'd say - in which case the standard 1.4 wouldn't be great as a 'drivers car'. A bit lacking. Try the 1.6 if you can. The 1.4TSI would be just about right without being mental.