I wear both contacts and glasses (not at the same time LOL

). I just recently got one-day use contacts to wear when I exercise and overall, I'm pretty happy with them. They are absolutely fantastic for exercise. It is such a relief not to have to be constantly pushing my glasses up on my nose or taking them off to wipe the sweat off my face. When I'm outside, my contacts don't steam up or frost over the way my glasses would. Also, they protect my eye better than my glasses do. When I run with my glasses on, my eyes water contstantly (literally, tears streaming down my fact) from the wind hitting them. With contacts in, no tearing at all. The contact lense seems to protect my eye from the wind much better than the glasses do.
My distance vision is also better with my contacts in. I'm surprised by how crisp and clear things are. My optometrist said that the contacts are a more natural way of seeing than glasses. They are correcting my vision to 20 x 15; it's pretty amazing.
Contacts are also great for watching TV. I like to lay on the sofa and when I wear my glasses, they push into the side of my head. Not a problem with contacts!
The biggest downside is that the contacts are definitely a little hard to get in and out. The single-use contacts are super thin and flimsy. I have no problem at all sticking my finger in my eye, but I still have to allow at least 10 to 15 min to get them in. At least once or twice a week, I tear one trying to put it in and have to get a new one (making them even more expensive than I originally thought). A couple times I've managed to lose one while trying to put in my eye. Sometimes I get the contact in but it isn't in the right position so I can't see out of that eye. Once I managed to put two contacts in the same eye because the first one didn't slide into position correctly and I thought it had fallen out. Once, one contact did fall out when I got to the gym and I had to do my workout with one contact in (since then, I always bring spares with me to the gym). Several times I've had one tear in my eye, once in the middle of my elliptical workout. Right now, in fact, I think I have a little piece of contact stuck in my left eye. I can feel it but I can't see it so I'm just waiting for it to work its way out on its own. I've only had my contacts since the end of February so I'm sure I will get to be much better at putting them in over time, but you have to expect a learning curve when you first get them.
Also, I can only wear my contacts for a maximum of 4 to 6 hours. After that, my eyes get too dried out and no amount of eye drops help; the contacts just need to come out. I've learned that when I'm wearing my contacts, I need to always have spares on hand and also always have a pair of back-up glasses.
I also only need corrective lenses for distance. For things within reading distance, it is easier for me to focus if I'm not wearing glasses or contacts. From that standpoint, glasses are better because I can easily take them on and off (and then spend half my life looking for them

). Once the contacts are in, they have to stay in until I'm ready to take them out for the day. If I'm doing a lot of reading or using the computer, my eyes have to work a lot harder with the contacts in and it tires them out.
I also think of my glasses as an accessory, like jewelry (obviously I don't have coke-bottle lenses). Contacts, not nearly so much fun in that regard. And I'm convinced that glasses make me look smarter.
Right now, if I absolutely had to pick one or the other, I'd have to go with glasses because I can't keep my contacts in all day. But if I could keep my contact in all day, I'd probably go with contacts for the convenience and because my vision is better with them. Luckily, I don't have to make that choice.