I tend to stick to Powerslave for the same reasons - and you can easily upgrade two allies and eddies as well as do trooper as well so it is a very good location. I only go to NotB or AMOLAD a few times a week to keep up the thrre star evo materials. I may go to Night City for gold when the update drops as that is a decent hike up in value and if I can get an auto team for the madness boss it could be good for gold as well - still sure that all in Powerslave is the best for eveuything other than three star evo materials!