For me........3rd generation G26. it's eats anything, with any size magazine and with polygonal bore, clean up is easy.
RIA 1911 .45acp and SA XDs .45acp, are both trouble free.
All SIG'S, that I own: P220, P245, P239 and West German Police surplus P6.
My 1960 DDR 9X18 Makarov in SA is a tack driver.
This space for rent.