What games? I swap to my linear MX boards when I'm gaming, and I think Ghost blacks or stock blacks are the best overall.
Best layout is "mini" aka 75% aka 84-key.
CSGO mostly, if not only. Blacks sounds fine for me. I also heard a lot of Gateron Blacks, too bad there is no a single keyboard with them being sold around.
If I recall, gateron blacks are lighter than MX blacks. I hear great things about how smooth they are, but they are new and have not been tested for durability.
i modded one of my QFS to lubed MX black and am happy with the quality, many days I prefer it over the expensive korean boards I own.
Linear is perfect for CS:GO
Since you have two blue boards, you could consider modding your own (the advantage being that you can lube the switches, or use custom springs
For clicky emulated switches I much prefer ALPS over MX, but do not like them for FPS gaming. On top of that, it is near impossible to find a good TKL with 6kro that supports ALPS