In my service return in listing shots, it's generally 2 mixed in with a few others occasionally for variation.
I also want to stress that I'm listing these from an intermediate player's perspective and I'd advise anyone else in the same boat to follow suit. If you try to play like FZD thinking you can banana flip 90% of serves I'm going to suggest that's an easy way to give away a lot of points. At least that's how it is for me. I need to maintain some sort of balance in my play to play well. Can't be too aggressive trying to be something I am not.
#1 Loop & Soft Loop:
So essentially any long serve to my FH, I loop. If it's a bad serve and perhaps bouncing little high, sure I'll use more power in my loop. If the serve is heavy on spin, perhaps a little more challenging of a loop, that's where the soft loop comes in handy. You're not trying to kill it. Instead, you're taking a little power off it, spinning it up. It will be slower but loaded in spin. Furthermore, if you add some (or a lot) side in the soft loop, some people really struggle to track those balls or might be caught off guard thinking they're standard. (note: I'm left handed so this might be different for you)
That being said, sooner or later as an amateur player, you'll run into someone whose serve gives you fits. It's long. You think you have a good read on it yet for some reason, you keep missing. Either in the net or looping it long. Rather than being a dummy and giving away free points one after another, you have to adjust. See return #2 here. (side note. If you're looking to purely practice, sure keep trying that loop. But if you want win, you have to adjust)
#2 Push (could be chop if you're an off the table player):
I play penhold and play relatively close to the table. So the push is an important universal shot that you can play vs any type of serve. This could arguably be #1 on the list because vs short or long, this is relatively safe vs any type of spin. Short backspin? You can push. A serve with side/top? Generally, you should attack but you can push. For a long time I didn't know this was an option but it is. If your push is good and if your touch is good, pushing a topspin ball back to the opponent continuing the spin can result in a very, very heavy ball. Assuming you don't push that off the table right into their wheelhouse forehand, you can take the approach of "Go ahead. try to open up on that ball pushed to your crossover point or backhand. I'm betting you can't do it and if you can, I'll be ready to counter expecting topspin back after my push".
As a penholder, there are several versions of this push/chop with the traditional backhand penhold (TPB). You can straight push. push/chop side/ back. Sometimes pure side. For you shakehanders out there, think Koki Niwa in some of his sidespin BH chops. There are lots of variations out there.
It's simply a very useful, not very sexy, but important return to have.
#3 RPB Banana Flip.
So I pull this out sparingly. I don't like the idea of being predictable of someone thinking, as long as I serve them short backspin, they'll always push. Or any short serve. So if I feel I have a good read on the serve or if it looks easy, I'll bust this out just to keep them guessing. It's also a fun shot that not everybody plays so it's fun for some oohs and ahhs.