It's
Fermion Sword > Almace > Tizona > (honorable mentions): Sagasinger/Anahera Saber
Almace is comically wide and was clearly designed with PLD AF3 in mind (not my favorite set either, AF3 was very hit or miss) despite having two other jobs attached as well. It doesn't look good on its own and it doesn't pair well with other gear with few exceptions. Tizona, Excal, Sagasinger, etc look good but they also pair well with more equipment.
Agree with Vyre that Caliburnus looks better than Excal, but I feel it's more selective about what it complements. Sanus Ensis is kind of like this; I like it with Tessera Saio for example but it feels out of place with most of my other lockstyle pieces.
Murgelis is also a weak sauce choice because it's just a standard rapier with a fluke in the middle (I mean it is a pretty cool fluke honestly). Which is just dumb extra weight, that is again, on A PIERCING SWORD! You really want the thrusts that your characters aren't doing to be slower? Blegh.
It'd be alright if it was down at the ricasso... and also reversed from how it is now, so that you could properly catch the opponent's blade with it to disarm them instead of having that part on the rear of the blade.
Tizona/Wightslayer has been my go-to lockstyle pairing on BLU for ages. Sagasinger is probably as close as I've gotten to that for RDM, though I've been meaning to build a lockstyle or two with Caliburnus.