Since I own and use both saws on nearly a daily basis, this thread made me wonder about REAL working weight differences. So, I fueled and filled up the oil tank and weighed both my 346xp NE, and one of my 5105s. Both wear 18" bars, with the 346 having a lighter weight bar on it and lighter chain. They were weighed on a certified scale and the 346 weighed 4/10th of a pound MORE. Not a big difference, but I believe most data shows the 346 lighter than the 5105, when talking powerhead only.
We are caught up in a Ford/Chevy, Cardinals/Mets kinda scenerio that no side will ever win. While it may be entertaining, it is a no win situation.
I like them both, they are both great saws, I just happen to prefer the 5105 for my application; felling 6-12" cull trees doing timber stand improvement. I cut mostly at or just below the waist. I do very little limbing. I am not very tall, 5'8", but very broad across the shoulders. The 5105 "feels" better to me. That doesn't take a thing away from the 346.
I prefer the 5105, but the 346 is a great saw. I think I'll sell mine, but the 5105's are staying.
Good luck Tallguys, hope this hasn't just made your decision harder.
Stick to your guns Troll.