If you want to also use your own coffee beans for single serve, I say get a Bunn My Cafe. The T-Sacs hold a gob of coffee and fit fine in the holder -- whereas the OPOD can not take a very big serving of coffee grounds in a T-Sac and it's easy to have to fuss around putting too much in and having to take some out to close the drawer.
If you're not into using your own coffee for single serve, I still prefer the Keurig b/c the pod offerings have not offered me any light-medium roast coffees that are not actually either too DARK tasting or too WEAK tasting. I used to like the Gourmet Cafe Columbian pods but in returning to them after not using them I could taste a darkness in there I did not want to taste.
So it does depend on what your idea of 'medium' roast is. I find Keurig to be soooo convenient, and while it is a waste fo money to buy the cocoa K-Cups (although they do taste good just dumped in the cup and brewed normally that way, not run through the K-Cup causing the need to rinse the K-Cup holder) -- and while teab bags may be more practical in either format, the K-Cup teas are nice and awfully convenient to have available.
My Keurig** is the lowly B40, which I am 100% happy with and don't plan to upgrade, even if this one dies and I have to buy a new one, which incidentally, it appears it is going to run forever with fairly heavy use from me. I'm into simplicity -- put the K-Cup in, push the button drink the coffee, no need to worry about whether I want a taller cup or a shorter cup or if it's going to be too weak or if a taller cup will fit under there or not -- and sure it looks plain without the cool blue lights but it sure knows its job and does it well.
If you want to use your own coffee in the Keurig, my recommendation is use the My K-Cup but also the pod-slayer (which we can tell you about if you want) but simply it puts a pod (or a T-Sac of coffee) into the pod holder and pierces the top so the water can flow through there better and the coffe comes out QUITE NICE, in my opinion, although in reality I now use only K-Cups and my two-cupper for the ground coffee. If you want to have only one coffee machine in your home (God forbid!) it is handy to know the versatility available to you if you were to get a Keurig or a pod brewer.
If you prefer the taste of pod coffee, and do not plan to run your own coffee through the pod machine, the OPOD is a better buy than the Bunn. I say that only because I had one of the many Bunns that started peeing all over my counter with less than two years' use, and although they cheerfully sent me a new one, it took a long time to get it. (Supposedly that little problem with the Bunn has been resolved in all models going out the door now.)
Now my Bunn happens to be my NIB standby machine, my OPOD is sitting on the counter wishing it had a loving home that needed it, and my Keurig and my two-cupper are my number one machines.
And really, how many coffee machines does one person really need? Really, now?
You may become normal like the rest of us and end up having to buy BOTH a Keurig and a pod-brewer!
hah hah haaaah --- I'll make that my PREDICTION.
disclaimer: I have never used the SS1 so I have no opinion on that. I didn't know they went out of production.
**My Keurig B40 is my office coffee pot -- I now (thank you Mrs. Long!) also have a nice new (RED!) Keurig B30 which is nice and compact and a pour-over; if you can stand waiting three minutes for your cup to be done instead of one minute, it's certainly a great item to consider! (Did I mention it comes in RED?)