I'm lazy, so I use my single unit squad against all raidbosses, those from allies and public shared alike. Except when I see one that's about to flee in less than 30 minutes, then I keep an eye on it.
As a result, my raid-boss unit usually defaults to the single-unit squad, meaning I shouldn't make mistakes too often either.

Look at this :

I hope it will reach 31 participant...

Unfortunately, it's not mine.
Mine got nuked less than 5 min after release. T__T