Don't be fooled by speed claims/hype, you can make almost any bow a 'speedburner' by minimizing overall arrow weight. You might not be able to hit anything with it, but it'll be fast.
What you're more likely to rely on as a measure of how good a bow is might be more in the collective line of grip comfort, smoothness of draw, quietness, consistency of results (with matched arrows), aesthetics, overall 'feel' (fun to shoot?)...and of course what memories it leaves you with as time passes.
Its hard to know what fits best until a person's style and form have been figured out and they have some experience with shooting for awhile. Until then just about any decently made and weighted bow will do. When time to buy 'custom', trying before buying is always a good approach.