Split em or leave em?

Hey folks,
So I have an over abundance of wood, and I am wondering if it's better to leave them in rounds or split em. I have no room in the shed for any more so it will be outside in the elements. It's pretty dry already and I probably won't be burning this stuff for 3-4 years.

Advice?

Thanks.

I knew I'd get responses quickly here!
Thanks everyone.

It is off the ground on pallets.
Poplar and Aspen
It's also in really short lengths (10"-12") as I have a wee little stove, so it dries super fast.

This was my first winter with a stove and last summer I lucked into a friend who was clearing some spruce that were too close to his house. I ended up with about 3 cords. I bucked and split it all...and knowing less than nothing, I was concerned I wouldn't have enough to last the winter. In the fall, another neighbour had a bunch of Poplar that he wanted gone and he said I could have. SURE! ...It's like asking somebody if they want free gas. How can you say no?
Well, spring rolls around and I take stock of my still massive stack of splits. I couldn't have burned more than a face cord. AND I still have all the poplar rounds sitting there...another cord and a bit maybe.
I burnt every day last winter in a sub arctic climate. So lets here it for small, super insulated houses and Morso!
...Had another neighbour ask if I wanted some spruce tress that came down in his yard this spring...and another wanted to make sure I knew I could go back into his place and take any deadfall I want to take on his 3 sections of land.
It's like an addiction!

I think I might keep the windows open all winter and burn burn burn!

so, keep it off the ground and reasonable protected and hope for the best seems to be the major theme. Split it when I get a chance or leave it...one way or the other isn't going to make too much of a difference (except the moisture retention the bark may create.)
Ok...I will deal with it one way or another....sooner than later.

Thanks everyone!

(I see a beaver brought down a birch over by the cemetery...might have to add that to my collection! I can't help myself!)