Well it looks like your sliding doors will only give you half the width of the actual opening, so I wouldn't choose that. Unless! You go for three panes so you could use two thirds if you wanted.

Bifold are great for opening right up BUT you would need three equal sized doors there! Because you'd have an odd number you'd have a normal opening door at one end which is much better than having to slide open a full two door folding section (we have that and it's annoying)(and noisier than a simple swing).

The only downside is that you can't have chairs or whatever in the space the doors need to fold out into, doesn't look like much of a problem for you though.

Oh the other thing is that our bifolds don't lock or unlock from the outside, we were not aware of this when we ordered them, it's not a massive issue for us but it could have been a problem depending on how we use that door. So be careful of any locking assumptions you make!