I have 2 good bikes (a Miyata 1000 touring bike with racks, mudguards, dynamo setup etc etc and a very lightweight Trek Emonda SL6 with Di2)
I'm also planning to do PBP next time round
I will most probably use the Trek ... no mudguards, no dynamo lights, but I will travel light with bike packing bags (I already have them .... Miss Grape bags) .... I will use USB lights and charge them with powerbanks)
a long distance ride like PBP and I will want to do it in the best time .... I also run tubeless tyres on both my bikes and will use them, but also carry a spare set of tyres and some tubes just in case