im not sure he's worth £12m more than higuain though when as you say, he has so much baggage.
quality player, no doubt about it, but when you've got the choice of higuain at £28m or suarez at £40m (minimum), higuain seems like a better choice.
deep down we know suarez will probably be off in 3 years time because he'll want to win trophies. we'll just be another stepping stone for his dream move to madrid, which all south american players want in their career, because of the cultural affinity and reputation that club has in south america.
at least with higuain he's won trophies with an elite so he might be more accepting of a communitarian club where he can call wenger his dad for the next 10 years, like most our players seem to do.