I've flown with TG, PG, VN and FD (Air Asia) in and out of PP over the last 20 years between Thailand, Laos and Vietnam.
TG and PG are both good - though PG A320s are getting old. VN and Air Asia no problems, except for delays on the air Asia side not being uncommon.
Malindo wise - regardless of the the Nepal incident last week - I would say that they are the best of any of the Lion Group airlines. I know many pilots at all the Lion Group airlines so its based on insight as well as personal experience with all of them. MAS is obviously preferable too but Chocks would obviously not fly with them given what happened in 2014.....(along with QF, SQ, EK etc given prior incidents).
You have plenty of choice and like everyone, you'll chose based on your priorities and needs.