which is a better line of choice for dough bait trout fishing... mono or fluro ?

Probably doesn't matter.

Dough bait is supposed to float. Im guessing this may be for trout fishing since i dont know anyone who fishes for bass with dough bait. You don't want it all the way on the bottom. That being said, fluorocarbon sinks and so I don't think it would be a wise choice. Usually I will use either braid or fluorocarbon for main line and then a weight followed by mono and dough bait. Usually 2lb and sometimes 4lb but nothing more. Hope this helps.

4lb flouro will not sink the dough bait. Even stupid stocked trout are born with amazing eyesight so I would go with fluoro unless you are going to fish 2lb.

Straight fluro is fine I use 8lb invisx fishing stocked trout and a small size ball will float my hook and line.

thanks guys. it is for trout fishing. i grabbed some Seaguar 6# invizX. im going to be using a thundermist t-turn swivel so the bait wont be tied directly to the main line.