Doesn't the C300 hence the C100 have a known issue with highlight aliasing/fringing ?
If this is the case it should be deal breaker.
It does, but it's surprisingly rare. Sort of like magenta highlights lol...
Overall it is a strange question. It totally depends on the project. And what response do you expect on here of all sites!
But no the prores footage isn't noticeably better than AVHD, however it's a lot easier to ingest and the texture is a little nicer in 422 HQ if you have to recover shadow detail.