Endless or Flemish? - both will surely do for bowhunting ...
Endless bowstrings are "spun" from one continuous strand of bowstring fiber. The strands are joined together by serving one of the end loops. Then the other end loop is served. The serving primarily prevents abrasion of the string fibers at the limb nocks. Loops can have additional strands added for added bulk on low strand count HMPE strings. Endless strings are crafted on a special string jig to precise lengths.
After decades of designing and building endless bowstring jigs, my "one arm bandit" jig is easy to build and works superbly ...
Flemish bowstrings are "twisted in the air" - no real jig is used or needed. Getting the proper string length is not an easy task. Instead of serving the string loops, extra strands are twisted and woven into the loops for abrasion protection.
Both strings of the same number of strands of the same string fiber type are of EQUAL strength. It's a myth that because Flemish bowstrings have more strands in the loops they're stronger than endless strings ... so, given the same number of strands of the same fiber, within the main body of the string, Flemish and endless will have the same exact same breaking strength.
After having spun and twisted thousands of strings over the last 50+ years, I've come to appreciate what I consider the superior consistency of endless strings. They can be made to precise lengths every time. They do not have the energy robbing "spring" effect of many many multiple twists. However, they must be created on a special endless bowstring jig. They can be made quite pretty by using two (or more!) different colored string fibers, for a "zebra" swirl effect. I look at it this way, too - there's a reason why Olympic FITA archers use endless bowstrings.
I also believe that neither Flemish or endless strings were the predominant bowstring type used in medieval times for warfare or hunting. Certainly both loops were not twisted or served into the string since those old bows changed brace height and constantly required tweaking. Though no ancient string has survived, I think Ye Olde Stringe Maker either employed a spliced loop at one and used a bowyer knot at the other end for efficiency and variability, or, easier yet, a bowyer's knot at both ends. It just seems so logical ... but I sure could be wrong.
YMMV!