Go with what feels more comfortable for you. Always play how you are comfortable, otherwise it will come back to bite you in the future.
If you want my suggestion however:
If you are used to writing with your right hand, you should most likely play tablet with your right hand and tap with your left, as your hand will be used to the feeling of a pen in your hand.
You will have to get used to tapping with your left hand.
Start out playing easier maps than you usually play and work your way back up.