How would you prune this new apple tree?

I recently bought this tree and will be planting out soon and want some thoughts on which way to prune. It's on m 26 rootstock and will be going on an allotment. I have posted a link with two options from the garden centre where I bought it. I can either cut out the main stem low down and have a single crown tree or just take out the lead stem higher up and have two crowns. What are people's thoughts.
Many Thanks.
https://imgur.com/a/XcTCzLv

 

There are 2 types of apple trees
Tip bearing (apples form at the end of the branch) and Spur bearing (apples form all along the branch).
Most apple trees are spur bearing.
So first check which you have.

Next, it's very important that your tree is properly staked.
The top of the tree needs to be able to bend in the wind - this strengthens the trunk and so will support all the big branches that will form over time.
The roots however need to be very stable.
If the whole tree rocks in the wind, then the new hair-like feeding roots will keep getting snapped and your tree will grow very poorly.
This is how to properly stake the tree - it's doesn't need to be quite so neat and tidy, but you get the idea. A clear area around the tree is important.
The top of the stake should point in the direction the wind comes from - probably the south-west



This site should help re. pruning and covers both 'bush' type and 'dwarf pyramid' type of shape - which is your choice
Apple Trees - Planting, Pruning & Pollination - Chris Bowers & Sons

PS - when planting make very sure that the graft (the knobbly bit low down on the trunk) is above the soil level.If you plant too deep, roots will grow from above the graft and you'll end up with an enormous tree.

 

The other latest reccomended thing is dig a square hole twice as wide as deep. The idea is that if you dig a round hole with smooth sides effectively you are creating a pot in the ground and the roots may just go round and round not out. With a square hole when the roots hit a corner they go into it.
As for pruning, having decided which shape you want, follow the advice above. The RHS website has good advice on pruning and establishing a young tree.

 

Thanks both. The square hole is an interesting one.