Yep... there is no best. I had front mounted on my last build... went top with this build... mainly because I felt like the "front/bottom intake and top/rear exhaust" made the most sense. The last build had a closed front (S340 elite) with vents so it wasn't the best air intake anyway... and I always questioned it. Made it a point to rethink the case this time...
... and OP is buying this case based on my recommendation.
Yeah... next week will be 3 months since the build... no problems to report. I haven't even cleaned it yet (LOL) which is just me being lazy. The case looks clean with no visible dust anywhere... even the filters. I'll probably do a closer inspection this week.
Yep... I replaced all the fans just because... i wanted them to be the same. The 3 that came with the case I still have... and if you change your mind OP and want them let me know. I was more interested in quiet performance than premium cooling. I'm in Seattle and my room temps are in the 60's year round... if I were in Florida surrounded by humidity I'd have to rethink the PC cooling perhaps.
Again OP... here's a pic...
I just put the 1 fan at the bottom... removing the solid shroud above. It was too tight of a fit to put a 2nd fan... I was unable to secure the PSU screws at the back of the case... and the wires from the PSU that are visible thru the vent would be in the way. If I had to do it again I'd probably leave out the bottom fan... but it's there now so whatever.
Let us know what you end up doing OP and if you want those fans...