I suggest just going with whichever makes your build feel complete. I got a 120 which doesn't need to go up to 125, so it stays there. I have a 125 that just needs those few extra points to meet breakpoints. I have a level 95 which meets all the breakpoints that I wanted for it.
That's because there's mutual agreement that after diminishing returns, builds that focus on 1 or 2 stats all conclude somewhere around 120, before points became wasted (thus sustaining points). Soul Level 120 was a round, average number which all standard builds started reached a ceiling. Some hybrids need a few more points, and most hybrids once they have hit their designated breakpoints end up at 125 max.
GreenKnight127 posted... I think it's interesting how people all agreed to 120 for some odd reason.
You obviously don't PVP very much. The reason why the community decides on a lvl cap is because it forces people to put thought into their characters and make "builds." If you just level as high as you wanted, everyone would be using the same characters.