What are the differences between Chanter summons?

[Wallau]

In the description I see only difference in cast time, duration, etc. there is a damage difference? Elemental damage? Should I get all summons as beckroner?

 

Thx!

[West]

I would respec each time I unlocked a higher level summon. You only need the best one available. 

[Godless]

I would respec each time I unlocked a higher level summon. You only need the best one available. 

I agree with this ideally, but currently I would caution against respeccing as it seems to be removing some permanent upgrades (such as the skill increases that cost 3000 gold) and potentially some ability points. Just something to keep in mind so you don't progress after your respec and realize you lost your skill points. Hopefully this is resolved shortly, as it has been reported.