Best domain registrar?
 

Which registrar(s) are the best when it comes to not backing down over disputes/complaints? This has nothing to do with spamming or illegal activities or the adult industry.

What kind of disputes or complaints?

Godaddy is pretty bad when it comes to suspending domains for complaints. Especially spam complaints.

Other registrars will just forward the complaint on to you, and they don't get involved in spam complaints. Gandi.net is like that, they only suspend your domain if it has invalid whois information. Dynadot is pretty good as well.

Not spam, more along the likes of somebody complaining that what's on the domain damages their reputation and could argue/threaten it's libelous - that's for a court to decide not a domain registrar.

Read what they say on Gandi.net then. They'd be a good choice I think.