They are all great reels so it's the small details that determine my rankings.
I like the MR2LA the best for these reasons. It feels and sounds more solid than than the other 2 on both retrieve and runs. It has free spool. I rarely fish deeper than 150 feet. 200 feet max on very rare occasions(and I run braid with a top shot) so the smaller arbour is not a big deal for me. Aesthetically it looks like a compact precision tank and the knobs and reel feet colours always match the spool and back plate.
Then the MR3. I'd own more of them if they were not overly ported. To me the MR3 have a ratchety, colder, cheaper sound to them and I think it's from the minor echos coming from the gear noise going through the extra porting on the drum on the spool. I prefer the cork drags over carbon disc because I like the slower progressive start up of cork drags and I like being able to open them up and work on them if they are not running perfect.
I was hoping I would like the TR3 and gave it a chance. I didn't like how heavy the drag is when it's turned back all the way and I don't like how sudden the start up is. I was always scared that I would drop the gear and think the bend in the rod would be relieved any second now but really the line was wrapped around a guide and the rod snaps instead. It's also doesn't sound as sweet as the MR2 or MR3. Even though it doesn't have all the extra porting of the MR3 it doesn't have any cork to soften the sounds coming out of it. It sounds very tinny and cold. Although they are bullet proof if something goes wrong they have to be sent in to be fixed. Gave it a month and got rid of it. All great reels. Rankings would change if I lived/fished in a different area. If I had to fish deep I would rank the TR3 number one because of the larger arbour and carbon disc drag reducing creep when deep water downrigging would be more important than the sound it makes. I don't get bothered with creep but I get very little to none existing creep fishing under 100 feet. Never lost a fish because of it and I just think about the scene from Jaws.