Urriak Uruk
Gaming is fun, and fun is for everyone
I agree Huge giants are more 'giant-like' (in traditional fantasy terms). That said, smaller giants are more accessible and usable in larger numbers. Facilitating adventures akin to the classic 'Against the Giants' series.
I mean... Against the Giants was converted for 5E officially. Although the hallways is a bit iffy, there are still a large amount of giants in the conversion and PCs can take them on in fights.