I am one of those who find the short ones too short...
115-125 is an outstanding lenght for average weights overall riding in "anything" (except really light wind where you need bigger boards).
Shorter, you get so many disadvantages IMO, that I personally dont find it good, not even with huge surf wings.
Others have a different view, but I got mine - the very short and lifted "nose" in front of your feet, really gives you so many advantages in terms of being able to touch down easy in waves, in chop, when starting, when landing jumps, when making a mistake, when hitting a lull in a maneuver, when dragging out with the board, etc.
And when that short, I dont find any noticeable difference in swing weight - so I think it is more a mental distraction if one find the 120 cm ones "slow" ha haa
Dont listen to me if I am the only one saying even a short nose gives loads of advantages - but for me, it really does
If you can pack a 105 cm board down for travel, and you do this a lot, well, then you have answered your own question.
You also got the T40 for normal lighter winds anyways.
But as said, I dont like the supershort ones.....
Jumping with smaller boards is great, so losing the option to mount straps is also a downside, besides you will find a nose helps noselandings, and assume you only bring one board when travelling, so would take the T22 (or at least something with that length) so you dont only bring a supersmall board on trips, and nothing but that