Ford Transit custom trend euro 5 2.2 125bhp or the euro 6 ?

Aup, i have been saving for a while now to get my first bare van and to convert it myself (with help from proffesionals 😉) i have done bits of research, and it would seem the euro 5 2.2 125 brake trend is one of the most reliable. Would you agree or would the equivelant top model with the euro 6 engine be better? ulez etc, i dont expect to be in those areas much but you know, just askinig the question on engine reliability etc, thanks