RM520N-GL vs RM520N-EU

Thanks for your help!
Regarding RM520NGLAP-M20-HP and any other GLAP modules, I have understood that firmware is old and cannot be upgraded. If so, then I feel to exclude any GLAP module and the choice remains between RM520N-EU and RM520N-GL.

Yes, I see GL has more bands and this is why I’m reluctant with EU version because if I change tower or the current tower get upgraded, I suppose the GL version has more chances to get better combos.

My tower has B1 B3 B7 B20 B38 N3 N78 and, supposing I have not misunderstood the above specs and they are the more recent ones, I don’t see any difference for such bands in any of the configurations.
So, I should expect that both should perform in the same way, but I see here european people getting very poor results with GL and I’m trying to understand if I could face the same risks. I have pretty much the same bands, mines are marked as B1 B3 etc while there I read A1 A3 etc. It’s the same, right?

I never played with such kind of modules, so everything is new to me and very hard to understand the right module to buy. Even harder now given that for my bands I can’t see any difference in both the modules.
Thanks