Much of this is going to be Toyota vs Nissan vs Honda, etc. Most everyone thinks they've got the best deal, the best package, the best whatever. Only if they have had truly rotten experiences are thy going to say something bad about a host or domaon registrar.
The fact is that GoDaddy is the most popular. I've got a number of clients with .co.uk domains who have used GoDaddy. I use them myself, but I'm moving away. I've seen cases where they will find some silly reason for cancelling a domain for someone and then selling it immediately to a higher bidder.
I've let one go for nearly two months, I simply don't want it any more. But I'll get a notice from them every other day or so, reminding me it has expired. I can't tell you how many "final notices" I've received. If they had someone on the line for that domain it would have been gone at 12:01 AM the first day it was available.
I'm moving to
www.dynadot.com. Right now they are a buck less than GoDaddy, but they are going up in 4 days.
The reall issue many have discussed is the value of the rest of what the registrars have to offer. Most of the rest of their services, are over-priced and under-valued. And they are of no help at all to a newbie.
My clients from this forum, and there are quite a few, have all spent days and weeks back and forth with questions and answers before actually paying a penny. See how much of that you get with GoDaddy, 123, 456, 789 or anybody else.
Plus, my carts are free and you don't need to know squat to use them. I install them and you enter your products, set up your shipping amounts and taxes and you're off selling. More than one has been selling the first day they've actually had their site.
That's what it's all about!