C1 and C2 are Chinese style Hybrids, very hard sponges and I wouldn't recommend them if you don't have a strong swing. That being said, you can achieve crazy shot quality with these rubbers if you can juice them properly
A1 is a Euro style hybrid, easier to activate than C series but less spin quality when you are really going at it. A1 is more lively than C series so it requires a bit more care in handling around the table. I think this rubber does everything pretty well, it is very versatile while still offering high shot quality. A1 is still pretty hard and you need a decent swing to reap the benefits, but I can imagine the softer versions play quite nicely as well. I have not tried A2 or A3 long enough to form an opinion