Keeping aside what technical definitions say, you can call any domain company the ‘best domain registrar‘ if it provides top-level domains (TLDs –e.g.: .com, .org, .info, .edu, .co, etc.) at the cost-effective price ensuring the best security. Similarly, simple user interface and dedicated customer support are the things that make a domain provider ‘a good service’.
In terms of what many vendors call unlimited service, Web Hosting Pad's terms of service indicate that its definition of unlimited is what it calls "incremental." Basically, as you need more capability, it wants to discuss that with you, both to help you get the most out of its services, and to make sure you're using its systems without abusing them.
1. Is it going to be a static HTML site or do you need a website builder or a CMS? If you only need a simple static website, any host will do the job just fine, so you can concentrate on the cheapest pricing. However, if you need a CMS or website builder solution, look at the best providers that include auto-installers or built-in website builders.
Rounding out the wins, InMotion offers a full 90-day money-back guarantee. On top of that, here's a special money-saving hint. In a chat session confirming pricing and offerings, the operator offered me some special prices and deals that reduced the published price by a few bucks. I was also told that while promotional pricing does go up at the end of the offer period, if you contact customer service, InMotion has a "loyal customer discount" that may bring the price back down.