I guess a bonus of using corsair is their terrible customer service should it go wrong. I've had some great issues previously with Corsair, maybe I'm biased against them but with reason, none the less, it's a hard one really, just if you can get the seasonic I always will, luckily in the UK Superflower are also pretty good in the budget department so it's generally Super/Seasonic fighting it out.
- EVGA has SOME superflower psu's. Either way Seasonic are pretty much my go to because of how good they are and the full package you get is just good for the price. For example my SS1000 PSU included cable ties, extra cables, screw driver (with phillips and flat head sides) and a cable bag. Of course that doesn't come with every PSU in their range but it was a super nice touch when I did my first build with their PSU.
in PSU's everyone will have the preference from previous experience.
Just to note though the CX fans are horrid and should never be put in any unit ever again. - Previous experience.
Thing is every product I personally have had from Corsair has just not been good or has broken, my case has massive damages to it (which occurred during shipping) which they want me to send the 900D to them to repair, like I'm sorry but I'm not going to spend 25gbp on shipping that to them, it wasn't my fault, also the retailer said I had to run directly through Corsair.. Though that's getting off topic