The 3 deluxe onsite Universal resorts -Portofino Bay, Royal Pacific and Hard Rock-give you the best perks( Express pass ,Early entry,walking distance/dedicated boat ).
The newest value/moderate Universal resort-Cabana Bay- opening next year will only have Early entry
There are partner hotels nearby that offer early entry, but no express pass and once the new Universal value/moderate resort opens there is question whether or not any of the offsite hotels will be offering early entry anymore.
Bear in mind...If you are going summer or later next year , the new Harry Potter expansion will be opening, and that will drive crowds up tremendously.Staying onsite will be beneficial