The best one for the job is actually myself, as I can regulate factors such as speed, strength of grip, etc to my liking. I also can palpate my scrotum & play with my balls to my liking as well. I usually never ask for anything. Whether it's my partner or my masseuse, she either does something on her own or she doesn't. I give them preconceived credit for being smart enough to know what men want.
That said, for the past 15 years or so, I would go for massages as much as i could afford to, which used to be weekly, but unfortunately nowadays i can only afford to a small handful of times a year. Having my entire backside caressed before i turn over & have my genitalia is massaged to climax is one of the most awesome feelings, perhaps better than the happy ending itself. Most of the time when i have a table shower & the masseuse soaps up & spreads the lather thoroughly on my genitals, she will greeted with my stiffest hard on as i get up off the table to be dried off & robed.
I notice the few times I try out a new place & there turns out to be no happy ending, i walk out of the place very depressed. One time a new girl started at a former regular place i had gone to almost weekly. When i walked out of the room, disappointed (unusually unhappy ?), there were 2 other women who saw me & could just tell without me saying anything.,They said something in Korean to the new girl, who then brought me back into the room and finished me off.
As for any partner I'm ever involved with, manual manipulation is ok, as long as it's not really more than foreplay (unless she's on her period or something & trying her best to satisfy me). If I am with a partner, i'd much rather receive oral or have actual sex.
Often while I masturbate, I fantasize about being masturbated while my hands are tied behind my back, thus yielding full control & access to my frontal to specific people who opt to take advantage of the situation.