Miko-constant beam healing, can be use at level one ult heals as well.
Down sides cant attack while healing with da beam ult can be detroy fair quickly.
Ambra sunspots to heal and a beam at later level. Sunspot also deal damage and ambra can attack while healing with sunspots(her main heal)
Downside sunspot can also be destroy, heal beam cost own health, sunspot lose health when damaging people so less healing.
Reyna gives oversheild can restore 280 health (plus 10 each time she levels up) restore sheilds, can undebuff the ally or increase oversheild shength, oversheilds can reflect damage its quick so can be attacking as well.
Downside heal and the other benfits arent till later not every battleborn has a sheild making that useless on certain people.
Kleese restore sheilds and can restore health passively so can be attacking as well
Downside needs to be close for the heals and not until level 5 not all battleborn have sheilds
There all pretty good miko is the best at level one but personally like reyna better nothing better than someone about to get kill next thing bang 280 health(depend on gear and level) 120 sheild back o and a 225 oversheild(depending on level) miko healing wont be helping the team in other ways like dealing damage.