team building for colo/guild

any can advice on my team. i'm going to level them to max anyway so pls comment. thx ^.^
selections:
mllb eurydike
mlb isis
mlb kaya
monica
delfina
alexander
grace
118/120 perecer
white tiger
nanael
merio
fallu
94/100 valeria
96/103 arger
46/100 abschied
103/106 felicita
103/106 raison

other than im reluctant:
oborona
renard

i need advice on both events cuz i cant think whether in:
1. colo: more dc better or faster unit better?
2. guild: more dc better for less number of units?

1. For colo, you want speed and preferably at least two slow skill units. Recommend investing in Edwin, Nyte, or Zandes.
2. For GA, it depends on the role you will be playing and the type of guild you are in. If you are an attacker, you want fast high damage dealers. If you are defense, you want tanky with high DC.

For colo, I would only use White Tiger, Nanael, and either Delfina or Eurydike and fill in the last two spots with some B speed slows.
As for GA, I'm not great judging units for that, so I can't really help you there.

Thanks! Am thinking of picking up alvida and paris in auction. Shud I get any? Or save for other 6*? Recommendations for other good guildbattle or colo unit?

For guild battle you're going to want a high HP tanking unit to frontline even if you're on offense. The longer it takes for them to kill your tank the more attacks you can do without spending AP to heal as damage carries over from battle to battle until you spend AP to heal your units.

I seee.. btw looking for health data for each unit and I cant seem to spot the search function in this forum

In general for the most part higher DC cost = more HP in regards to melee units which will be up front due to their shorter range. There's a few exceptions here and there.