I would say probably Daz's new loader because a lot of ppl complain that Hazar's loader does not work + Hazar dropped support with his loaders and is now working on other tools like RemoveWAT and things like that. I like hazar's programs but Daz added encryption and a bunch of other features to his loader to make MS even harder to detect.
Well sorry guys I don't know what to do with 7loader anymore as there is no point, Daz is the leader of that game, so I think alternative solutions are my best bet.
Based on system compatibility and the ease of use, Daz's (with zsmin) loader is the best IMHO. If you want to add OEM info to your copy of Windows 7 (pictures and info in your Computer Properties window), then use Hazar's loader for that, as it has many options for different OEMs info.