It depends on game genre, portability needs, and eyesight. An 11" screen (typical on ultraportables/2-in-1s) has trade-offs:
If gaming is primary, **13.3"–14" (16:10) or 15.6"–16" is the sweet spot**. 11" is a compromise for extreme mobility. Consider a portable monitor (15.6" USB-C) for hotel/desk play.