The Carisma is a decent car and it is imported by CML so there's plenty of spares support there, but the Maverick range has been around for a long time so there are more shops stocking them and their spares, and they are from HPI so again plenty of support. My choice would be the maverick, just because there are more of them around and more places stocking parts, but what your local hobby shop supports is usually more useful as buying locally means cheaper spares when you add on postage costs.
You won't notice any difference on track and they won't be competitive for racing once you move out of the novice class, but they will teach you how to drive with a fairly indestructible chassis that's cheap to repair when you hit anything. It will also let you try it out to find if you like racing before spending a lot more money on a race chassis and electrics.
Both can easily be converted for drifting, the only difference between the racing and drift versions are a locked rear diff and hard drift tyres.
If you want to race I would suggest going to your local clubs first and find out what they are racing and whether you like the club atmosphere, if they run buggies or GT12 then your touring car won't have anywhere to race.