Well, if I recall correctly, a 4* +10 unit has 'slightly less stats' than a 5* un-merged unit (or at least it was when I was looking at a 4* +10 vs 5* +0 Cherche) so if you don't mind the slight decrease in stats (and potentially saving 20k+ feathers) then a 4* +10 unit should do you pretty okay, if not better than okay.
As far as the units listed... I guess it really depends on what you're planning to do with them. Of course, a +10 is better than a +0, so if you plan on using the unit, then, in my opinion, you should go for it.
Basically, if there's anything to take from this comment, you should +10 any 4* as long as you plan on using them (and there's no one else you need to fodder them off for). That's why you see so many people using 4* +10 Cherche's.
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