I would center the belt buckle — more comfortable
Personally I like a centered belt buckle. However, there is a reason the belt buckles are to the side and not just for fashion. It's so that when you are dismounting the belt buckle does not scratch your saddle. Before I dismount I adjust mine to the side.
Most people do. I personally hate it, but I do what I see the older riders doing. It is a little uncomfortable, but I tough it out.
Personally I would say no