Firstly, move and Mira would be same for parts availability. Parts of both are not generally available, just old cars market.
Second, there are 2 types of parts. Maintenance parts like filters, plugs, etc are easily available since these are compatible to other generally available cars (like cuore). So for regular oil change, tuning, etc, you won't find an issue. Then there are body parts, lights, bumpers, etc. You will NOT find them in open market, and will have to search them in old cars baarra. This is the deal with all imported cars. You can either go yourself, or pay your mechanic to find it for you (he will charge double, but will save you hassle).
Coming from Suzuki, it is a big comfort in life, buying move or Mira. If u drive peacefully and don't hit it, then it is good. If there is an accident, then it will cost you. But accident always costs you, no matter what car.
I would recommend you buy it, and buy MOVE due to significantly big cabin space (Mira is almost same as Suzuki). You will love it.