The line magnetic amp is a single end triode amp and the Primaluna is a push pull amp,so they will sound different.
The Line Magnetic amp will have a magical midrange with a more open airy sound,The Primaluna will be dynamic and dead quiet,I have used a Line Magnetic LM -219ia with my Klipschorns and that amp was one of the best sounding amps I have even had in my system.Mine had upgraded Psvane western electric copy 300b’s and 845’s and upgraded Telefunken 12ax7’s.The only reason I sold it was the weight and the heat of the tubes,plus the fear of one day having to replace the tubes.I now listen to 3 different amp,preamp setups and each one has its strong points
Dennis Had sep tube amp with matching lp3a preamp
great combo that is great with my Klipschorns sweet sounding pair,very detailed with alive like isound that is easy to listen to..I just wished the preamp had a remote control.
line Magnetic lm-126ia Limited Edition amp based of western electric design very close to the LM-219 and I have it for sale due to weight and size.
I am using a Primaluna Prologue Premium amp and preamp and I am using it now,a little closed in compared to the Inspire pieces or the line magnetic amp,but dead quiet and very dynamic on my Klipschorns .If I was going to buy a amp now Primaluna has just released new models and you should be able to get a deal on the older models.I don’t think you can go wrong on either of the amps you have on your list.