Which two would you keep and why ?

For me, the sound is a big deal. The F1 banshee wail is something that I love and crave.

CGT and F50 are sister cars to a large degree. Both have engines derived from F1 engines of the early 90's. Both are very similar in design and CF construction. Sound is awesome. Manuals. Tops come off. I also own both currently and both are permanent fixtures in the collection. Really interesting to examine both side by side.

LFA and GTO. You could look at these as the "halo" cars of the respective brands at the time (2011). High pitch banshee wail is present in both. LFA is an amazing car to drive and I am currently hunting for one. GTO is much larger and heavier and grows on you with time. Love the final iteration of the super fast gearbox. Great cruiser. Currently occupies a space in the stable.

V12 Manuals
Not sure if I would classify any of these as long term keepers. None have the F1 sound either.