Very easily mapped to near on 300bhp for not a lot of money I believeIt's the torque you should look at. According to the page I just found: the 150ps TDI has 340nm. While the 150ps TSI has 280nm.
If I was carting about the additional weight of a camper conversion I would want more torque all day long.
Apparently there is a 204ps TSI has 350nm. But I presume they command an extortionate premium.