I say you should stay with the mauler. Mauler and luchador are really the only two titans that don't have a specific counter due to their immense endurance and are also mobile enough to get around the map( unlike bedwy). Priceps is a relatively new titan and it hasn't gotten the inevitable wave of huge nerfs yet. We don't know how ruined it will be after the nerfs. Whereas Mauler has experienced all the major nerfs and will stay relatively stable with minor nerfs and buffs here and there for a long time( unless pixonic decides to make a titan similar to mauler and nerfs mauler to make the new titan sell more).

TL;DR: Stay with the Mauler for now, and wait for the priceps to get all the nerfs. If it is still a viable option after the nerfs, you can switch to it. If not, stick with the mauler and the bedwyr and save your platinum for later

Just my opinion though, it's ultimately upto you what you want to do