Ear Loop Masks are easy to put on and take off, this is their main advantage. BUT, you may find the Long Ties ones are more comfortable if you are wearing a mask for longer than an hour or so. You may find the elastic starts to hurt your ears (you may not of course, especially if you have found the sweet spot for your knots!)
Long Tie Masks take a little longer to put on, but they guarantee a great fit, and, the behind the head tie styles can be more comfortable than the ear loop ones if you are wearing your mask for more than a couple of hours. These tie styles mean you can also pull your mask down after use, but still have it round your neck, so you can sort of carry it like this, without having to touch it.
How to measure your face for a mask