Keyboard layout is all personal preference. I'd go with whatever layout you've been using. If you do make a switch in layouts though it won't be a big deal - might just take a while to get used to the change.
I personally do not own a Filco - the only mech. keyboard I own/have owned is the Das Model S Pro (MX Blue Switches). But I have been doing a **** load of research and the Filco Majestouch consistently comes up one of the best choices. They do seem to have some very minor and random issues, but what keyboard company hasn't. These issues also seem far and few between. Anyway, the Filco Majestouch would be an excellent choice for your next keyboard - so much so that it's going to be the one I buy next
What is your native language btw?