I know that brace height is better if you have more of it , but is higher reflex good or bad???

Don't take those specs too seriously, you should shoot the bow that fits you best no matter what the specs. BTW I don't know how reflex affects shootability and I'm not entirely sure what it is

Reflex is part of the bow's geometric design. A bow can either be reflex, deflex or straight and that is principally determined by where the grip is in relation to where the limbs meet the limb pockets. If the grip is closer to the string then the bow is of a reflex design. More reflex usually means a longer power stroke and a shorter brace height (not counting parallel limb bows) which in turn means more speed.

Is it good to have a higher amount of reflex? Yes in that it can potentially offer you more speed when coupled with a shorter brace height. No, in that it can make the bow more critical to shoot.

It use to be that highly reflexed bows had very short brace heights. With the introduction of more parallel limbs, the brace height has been increased on these highly reflexed bows. This has made many of these reflexed bows quite shootable. It appears to me that the brace height is a much bigger concern than the amount of reflex.

Still, with the handle behind the limb butts, reflexed designs are much easier to torque and are much more demanding of good form than deflex riser bows.

Get a reflexed bow with 80% letoff and a deflex riser bow with 65% letoff. Draw each one and intentionally twist the handle back and forth. You'll immediately see what I'm talking about. It's nearly impossible to torque the deflex riser while you have to be careful not to twist the reflex riser bow so much the string pops out of the cams' tracks.

My form isn't perfect, so I prefer the deflex riser... even at the cost of some arrow speed. Even that though... A deflex riser bow with a brace of 8" vs a parallel limb reflex riser bow with a brace of 8". Exactly the same power stroke. All other things being equal, they should have exactly the same speed.

Deflex riser bows deserve to be in much more demand than they are. Especially so with the average bowhunter who can't - or won't - practice his shooting as much as he should.

I think one of the reasons archers tend not to pick deflex bows is because they prefer the looks of a reflex riser. Too many people choosing bows because they like the way it looks or feels, instead of the way it shoots.