been running an iFlight Nazgul5 for about a year now, its held up pretty well but ive had two ESC issues which iFlight support was honestly kind of useless about. friend of mine keeps saying Diatone is way better build quality but he's also a Diatone fanboy so i take that with a grain of salt. not looking to spend more than like 250-280 on the next 5inch. also running DJI O3 so that limits some options. curious if anyone has had long term experience with both because most reviews ive seen are just like unboxing and a few flights and that tells me nothing about whether the frame is gonna crack after 40 crashes or whatever.

ran a Mamba powered Diatone Roma F5 for about 8 months, thing was a tank honestly. the stack is what makes or breaks those builds and the Mamba F722 in mine never gave me grief. iFlight stuff is fine but their AIO boards have had some known issues with heat especially if you're pushing higher kv motors in warm weather ? seen a few people mention that. for O3 compatibility youre not really losing much with either brand, both support it fine. id maybe also look at the BetaFPV Aquila or even Flywoo stuff in that price range, Flywoo's build quality has gotten a lot better in the last 18 months or so

this is kind of off topic but the ESC support issue you mentioned is such a common problem across basically all these Chinese brands tbh. iFlight, Diatone, Holybro, doesnt matter ? if something goes wrong past the return window youre mostly on your own or relying on the community to help diagnose. thats actually why i started building from separate components instead of buying prebuilt stacks, easier to just swap one bad part instead of the whole thing. anyway yeah Diatone frames feel solid in hand but i havent crashed one enough times to give you a real durability answer