AI L1 sound better than AI M3?

I just replaced my Audible Illusions L1 with a used Audible Illusions M3 cause I bought a Scout. Don't know if my ears are deceiving me, but I think the L1 sounds much better playing my CD player. Might be that I have 6H23 tubes in the L1 but 6922s in the M3. Does anyone have any experience with both of these preamps and have an opinion on which sounds better?

Thanks,
Winston