Did anyone ever wonder why Vader doesn't try to force choke Obi-Wan or Luke during their duels? The best explanation I could think of is that its much harder to force choke a Jedi than it is to force choke an average person. Maybe Obi-Wan and Luke would know how to block a force choke if Vader tried it on them, or they might even be able to force choke him back. This is one reason why force lightning might seem more impressive than a force choke. We've only seen force choke used on non-force sensitive people in the OT. However, the Emperor used lightning on a full-fledged Jedi Knight. He didn't even need a lightsaber and could defeat Luke with just force powers, unlike Vader who had to use a lightsaber against both Luke and Obi-Wan.