Reviving this old thread for lulz.
http://harem-battle.club/flower-knig...per-teams.html

600-700 is my own, for teammates no special requirements. Just want to quickly end the time to run the map.

Most of the time I don't even look at the speeds. For farming 14-5 or events I simply pick a random one - as long as at least 4/5 girls are 70 and evolved they will do just fine. But if I had to choose, I guess 600-700 would be the best.

I prefer allies with medium ~550 speed for events and new map. For 0 stamina secret map from gacha events I prefer really fast team with more than 700 speed. For manyu/dragons maps, I don't care.
And for map that needs team with really high speed difference, I had allies with speed from ~450 to >700.

I'm actually a sucker for most of the speed boosting girls, Anthurium and Alpinia in particular, so I tend to pick teams that lean on the faster side as far as helpers go if only because Anthurium is best girl. It tends to work better than slower 400-550 teams if only because most of my teams fall in the 600+ speed ranges.

Most of the time my Teams have ~500-550 Speed, so I like to have a Helper with the same Speed or slightly faster (because play last). So I answered 500-600.
Note sometimes I prefer 400-500, so overall, I would say 400-600.

600 is my butterzone; not too fast to drastically outspeed my squads when trying to 3-medal clear a map, but fast enough.

600 also. My teams are all between 580 and 660 so that's the best area for speed matches when trying to 3 medal. If I need something really fast I'll usually use my own setup because it's there every time I run the map. Squads below 500 I rarely use as a helper, they certainly don't do anything when I do. On the rare occasion I need a very strong web nullifier or more than one then I'm reliant on helpers for now. (Thank you Zerana for keeping Dipladenia in your helper team).

my units are between 400-500

too bad the speed boosting gurls are somewhat weak cept Edelweiss who manages to stay in the auto power sort
Dipladenia couldn't make it in.

trying to lvl Indian-chan to lv 60 and see if she makes it in or not

My avaraged speed unit is between 470 and 500 speed, so I prefer helpers to be around that speed as well, to keep the speed of the whole group relatively even for those maps that require it.
For my regular unit, it doesn't matter much, the main squad is 887 speed, while the second is 742 speed, so they're usually leading the other squads anyway, and generally very capable of clearing an entire map and some alternative routes. My second squad might drop to 590 speed soon though, in which case a fast helper might become useful.