Doubt about updating JB Odin/OTA

Hello guys!

Coming as I come from the Nexus family, I try to be as close to the stock experience as I can. So i'd rather wait for the OTA than flash it trough Odin (not that I'm afraid, done it many times to other phones).

But I'm reading many things about the wonders of flashing from a clean ICS, which I'd rather don't do since when the OTA arrives to Spain, I'd like to say OK and update.

So what I would want to know is if it's cleaner to install JB from a clean ICS than install it from OTA and then Factory Reset.

Also, ¿should I do the factory reset in JB from the stock kernel or might still be "bricking dangerous"?

Thanks!!!