There is not much difference in weight between the 151EN (EN types do both gas and gasless wire) and the 160TM. They are both rated at 150A output at the top. The 160 has a carrier plate for a medium size bottle, and nicer switches. It may have a slightly higher duty cycle at the top end, but this is mainly theoretical, as it would only amount to seconds rather than minutes. The one advantage of the 151EN is that is very portable when used with gasless wire: no cylinder to lug about. No problem wheeling a cylinder about at home, but often a pain when doing small jobs away, loading, securing, unloading, do they have a trolley over there or do we take one, Etc.