I use and like Gandi. If you're worried about social engineering though, I'd probably go Google since they would be the hardest for someone to get ahold of.
As far as I can tell, Google, Cloudflare and Namecheap are really the only guys in town that don't fall for stupid shit.
I've heard of past concerns about some of Gandi's internal procedures and even ignoring that, they've been acquired by a venture capital firm of sorts.
If customers can't reach the support centre, neither can scammers.
An excellent case of "it's a feature, not a bug".