From the stand point of weight, accuracy, and durability both the Lee Enfield and the Mosin Nagant are similar although the full length MN would be unwieldily. The butt plate of the Mosin Nagant is perhaps the worst in the history of firearm design, and one wonders what the Russians had against their soldiers that they would choose such a shape. The 7.62X54R has a bit more velocity with bullets of equal weight, but not by enough to have a clear advantage over the .303 in practical terms. An SMLE is easier to scope than the Mosin Nagant, and about the only scope mounting systems that can work due to the MN's split bridge are a side mount which has issues, and a scout scope mount ahead of the action, that not everyone is happy with. The Lee Enfield's detachable magazine holds more ammo, but the MN's can't be lost unless one unclips the base of the floor plate. In their better examples, feeding is reliable in both rifles. If used with issue sights, a #1 MK III and the MN are about even, but a #4 or #5 Lee Enfield with the ladder peep sight and the large aperture battle sight is leaps ahead. If you get one with the non-adjustable peep sight I would try to switch it for the ladder style. My pick between the two would be the Lee Enfield, if I could find a good one.