The one ear thing is an AQHA, APHA thing, at least nowadays.
Arabs that show Sport Horse tend towards no or a very small bridle path. Arabs who show main ring have a longer one. Arabian Sport Horse Nationals is in about 10 days, you can see what the trend is there in person or through pics :yes: If you are doing dressage I would opt for a tiny or no bridle path, more room for pretty braids!!
This is from Region 4 Sport Horse Champs in May of this year-
Region 5 Sport Horse Champs this year-
This group has good info too-