Larian Studios Forums Divinity - Original Sin Divinity Original Sin - Help/Tips/Tricks What is the best spell group for summoning

I want to make a wizard with strong summons. What is the best spell group to invest in? Geomancy is the obvious candidate, with no less than 4 summons, while Witchcraft possesses two separate summons. These are the two obvious candidates. While Geomancy has more summons, I have read that the Witchcraft ones are by far the strongest. Is this true?

The remaining spell groups only have a single summon a piece, but as long as that particular summon is rather strong, it would be worthwhile to obtain. Are the Fire/Ice/Air worth investing in their respective skill groups for?

Thanks for the help.