I have a no-name-brand die grinder that has done well for me. Mine is straight, not angled. What's better, depends on what you are using it for. (Or get both)
I have the biggest compressor I could find that would run on a regular 110V receptacle, and it has a 32 gallon tank. Receptacle pretty much limits continuous power to around 2 horsepower, and I think it is really a bit less than that. It won't quite keep up to air demand from the die grinder, but with the size of the tank and the compressor running, it will go long enough to be useful.