It's good to ask because unless you've owned one, you won't know what to look for.
My first holster was a Desantis Tuck This :
Looks pretty small and cool right? There are a couple problems with this design.
1) The grip of the gun is basically riding on the belt, making it near impossible to get a solid, fast, grip on the gun. Think about trying to draw fast and throwing the gun instead of pointing it. Not to mention that it is canted in a manner to increase conceal ability, but greatly decrease accessibility.
2) It came with another kydex clip that is shaped a little different to allow you to can't the gun into a vertical position, but it still tucked the gun too low in the belt. I drilled a new hole about 1 inch higher and cut off the excess. It was better, but if I tried to cant it more more forward than vertical, the clip got in the way of the trigger guard and again prevented getting a solid grip.
3) Mag holder and holster in one? Great idea! Until you try and grab the fresh mag with your off hand reaching across your body. Not to mention it just made the whole unit heavier, not to mention it puts all that weight on one side of your belt. I never carried a mag in that pouch. Lastly, that mag pouch is really only sized for compact mags, and even then, it gets in the way.
4) Did you notice the size of the belt clip? It is 1.5". That is perfect for my 5.11 tac belt that I got for free with the pants I ordered, but every single one of my other belts are smaller and allow the whole rig to move around.
4a) With only one belt clip, movement is increased and the gun remains relatively in the same spot, but not EXACTLY in the same spot like it does with my Spartan holster.
There are some positives to this holster though.
1) It fits in my glove box, so if I even need to take my gun out of my Spartan I can put it right into the Desantis and toss the whole thing into my glove box. I also use the Desantis in my bedside safe since the Spartan has no chance of fitting in there either.
2) That single, giant belt clip makes it easy to remove the whole rig with the gun holstered the whole time. I basically have to take my belt off with the Spartan.
3) The compact size of the holster makes it easy for me to toss on a cheap, light weight belt under my running clothes and attach the holster to that. I wouldn't run, or other wise wear my gun around the house in sweat pants, with the Spartan.
So, as I've mentioned the Spartan already, a short list of the pros are:
1) Keeps the gun in the same place, all day, every day.
2) More versatile options for belt clips and cant adjust-ability.
3) The leather backing covers the whole gun, so I don't have to worry about cold hard gun directly touching my soft underbelly, or my man sweat ruining my gun's finish.
4) Adjustable tension.
5) A cow died to make it.
Hope this helps shed some light on what to look for, even though it didn't cover any body type issues.