Love pig never had boar. Only advice I had on boar was a guy I know in Texas that has gone hog killin on Texas ranches. He said don't bother with adult males for eating. Get either a female or better yet a youngster.
Any young is typically better than mature animals.
Button-buck or doe. Veal. Hens. The spring lambs, Clarice.
Older animals get tougher muscle, and also have more time in the wild to acquire parasites and sickness.
In captivity, it's simply a matter of how long you feed the bastards 'til they reach their full potential. Nobody would keep a chicken for two years when it doesn't get any bigger after six months.