Sliding doors for me. More configuration options, less vertical lines, ease of operation, and with some clever design, you can still get the same opening size.
Talking about conventional sliding vs stacker - sliding is cheaper, stacker has wider opening, stackers need regular adjusting, stacker may require more door panels / frames
Architectural grade stuff - sliding can deliver the sleekness if the door/s are concealed beyond the wall - http://lockyerarchitects.com.au/project/post-post-war-house-2014/
I have a whole wall that I need to block off with some sort of door. I'm thinking that a bi-fold door would be awesome. However, my husband kind of wants a sliding door. I just think how cool it'd be to have a whole wall made up of a door that could easily be tucked away when needed. This would make outdoor barbecues a lot easier. It would sure save me from having to open the door every time. http://www.superiorwindows.com.au/content/Products/BifoldDoors.aspx
Bifold give an unobstructed view and more useable space
I recommend getting a quick audit from a professional, everything said here is obviously very useful but I always find it a bunch more helpful to get a personalised phone call. Most people are happy to talk for 20 minutes and most of the time it saves me hours and hours of research. I went with these guys when talking about it, installed the doors myself but they really saved me some time http://www.rylocknunawading.com.au/
Depends where you live. If you live anywhere that is partial to flies, mosquitos, moths etc (as in most of Australia!), I would get sliding stacker doors so you can add sliding fly screen doors (also extra layer of security). We chose this over bifolds several years ago - no regrets at all. We have three panels so even when the doors are all the way open stacked up, there's still quite a big opening.
You will get a great result with both. however, with a Sliding stacking door you can get a sliding security screen which you can't do with Bifold doors. Something to consider.
Does anyone know how aluminium sliding doors stack up when compared to more traditional bifold doors? Calling these lads to get it installed but I'd like to do it myself and want to know how difficult it is, thanks! http://www.rylocknunawading.com.au/