Mainly I think you just need to figure out how you like to load.
I have tried loading at normal table top height, seated in a regular chair.
I did not like it.
The benches I have made, I build them so the top is at my waist height.
I can work them standing or seated in a stool.
I prefer the stool.
Some presses I still had to build a base to raise it to a comfortable working height. I did this with my Hornady press.
Basically play around find out how you like to work.