I personally wouldn't build a bike around a power meter. But you obviously had sram in the past and liked it? It's apples and oranges. I tried sram on one bike. It was only apex but I hated it. I could never get the front derailleur to shift consistently, it always took two or three throws of the lever to shift and yes I dropped the chain too many times. I have had several models and generation of Shimano that have all just worked. The current Shimano 11 speed groups got everything right in my opinion..but it's just opinions