Only thing to add is that the Barca course is very different to Celtman solo, and so you are going to be sat on the saddle for longer with less need to be out of the saddle like Celtman (not really many hills to speak of, more just draggy uphills). The transition area is huge in Barca and busy. Already lots to remember for me without also trying to find a changing tent. But also agree go with what is comfortable and what you are used to if not used to tri suit. As an aside, my mate did Lanza this year as his first full IM. Had a bowl of pasta in T1, wore his Falkirk BC gear for bike and then different run gear. But the Lanza bike (duration) is maybe 1.5h longer than Barca, and he wasn’t focussed on a specific time.