The difference in port height really only applies to tongue relief until you get into the really big
ports like cathedral bits which are designed to use the soft palate as another pressure point for even more subtle cues. Most average ported bits (low or high) won't affect the soft palate if the curb strap is adjusted correctly.
Some horses with really fat tongues need a higher ported bit like the first one you posted. Others with really low or thin tongues can use a mullen mouth and still have plenty of tongue room.
Because of the way that I ride and the way I expect my horses to carry the bit, I generally really like low/medium/sweetwater ports in my bits because there is just enough tongue pressure for the horse to pick the bit up and carry it themselves instead of just letting it sit there on the bars of his mouth.
Just for example, these are the types of bits I normally use. But, I'm not sure if something like one of those would be suitable for the style of riding you do...and I'm not sure how easy/hard they would be to find over there.