I just bought a 14" Marshalltown finishing trowel, as i currently on a plastering course and i thought it would help. However a sticker on the trowel sates 'helps biginners finish concrete like a pro'. but i want to use it for palstering... ... should i have bought the 'Marshalltown Permashape Trowel 14"x5" 356 x 127mm' which is about £8 cheaper?