Army with decent stats or a small squad with REALLY good stats: what’s better?

Just what the title says. On day 90 on a current playthrough. I have a decent sized group with, I believe, around 20-25 characters. A handful of my dedicated fighters are between 35-45 in most combat stats. The rest are mostly engineers with good enough stats to not die instantly.

The one gripe I have, of course, is just the sheer amount of micro managing I have to do with this size.

So which is better in your opinion?

Thanks!