Oh, this takes me back....
I spent weeks testing out the alternative throttle modes before settling on full-range.
Main thing was, obviously, the lack of a positive central all-stop position, which is actually more of a nuisance in the SRV than in ships.
Also, I didn't like sacrificing "resolution" in throttle control. No idea if that really is the case but if I can have a control with a larger "throw", I'll usually choose that to provide more accuracy.
I was a bit concerned that using full-range throttle would mean no ability to apply reverse thrust to slow down quickly.
Thing is, with FA-on, your retro-thrusters do fire anyway.
IIRC, you do stop a bit quicker if you manually apply retro-thrusters but you should have a momentary thrust control set that allows you to do that without swapping to "reverse gear".
Again, if you're a big SRV user, it's worth considering how this might work in the SRV too.
It might be worth considering half-range in order to have active-braking available in the SRV.
Personally, I just dab the "handbrake" to provide maximum braking when I need it.
Main thing that guided my choice of throttle was that I set up good momentary thrust controls first.
I have left/right/up/down momentary thrust on my joystick and backward/forward momentary thrust on my throttle.
With that in place, I used to have the forward/reverse toggle control on my throttle but I ended-up re-binding that as my silent-running control 'cos I never used it.
Now I just don't have any control bound to select forward/reverse gear cos it's just not a control I ever need to use.