35mm on FF would be too wide for most wedding shots, IMHO. Maybe a different story if you are shooting two bodies (not just carrying the second body as a backup) and you have longer on the second body. I prefer not getting too close to people - feels intrusive and yields odd perspective. The 35 might work for large group shots, but I've *never* not been able to set up a large group shot and capture with the 50. You know how large the groups will be and you choose where to shoot
It sometimes can get tight if you are stuck indoors (rain, etc). I might have a 35 with me and carry it in a pocket if I see a lot of tight shooting is in the cards, but a 50 would be my vote.
As to which one isn't so obvious, but I expect the 50 1.4 will get the most votes between the 50's. I know several wedding shooters who use this as their main lens. That said, one shooter is on her third iteration due to focus failure and I had to return mine due to inability to focus. I got a 50 1.8 for $80 including filter. It's a tad fragile so I would take a backup lens (zoom probably) on the backup body. The cheapie lens is also as or near as sharp as the 24-70 L due to not having to zoom. I'm hoping Canon comes out with a revised, sub $500 USD 50 1.4 that updates the AF and is more robust. The 24-70 is, these days, regarded as THE wedding lens, but as noted before I prefer primes.