My favorite cup of coffee to drink over the last several weeks has been a brew of Van Houtte Eclipse X-bold made in the Keurig B-50. That being said, based on the current coffee selection in X-bold K-cups I'd have to say I prefer the Bunn My Cafe hands down.
I've tried the Green Mountain and Tully's K-cup Sampler Packs as well as some single flavor boxes of K-cups and the only two K-cups I really like to brew up in the Keurig B-50 are the Van Houtte Eclipse X-Bold which I like a lot and the Green Mountain French Roast which I like a little, but would probably like a lot if it were X-bold because I like to brew 7.25oz at a time and it's a little weak at this setting. Also, so far my two favorite coffees in general are light roast Kona Blends and light roast Columbian coffees neither of which are available in X-Bold K-cups.
There are a lot more varieties of pods out there than there are X-Bold K-cups so I have been able to find more coffees I like to brew in the Bunn than in the Keurig. In addition, pods that give me a bad brew in my Senseo can give me a descent brew in my Bunn. Somehow the Bunn seems to bring out the best flavors in the pods; flavors that you don't get with the Senseo. Thus, the Bunn seems to have a large sweet spot that allows you to get a good cup of coffee with a larger variety of pods compared to the Senseo and compared to the K-cups available for the Keurig B-50. I'm concerned that while I like the Van Houtte Eclipse X-Bold K-cup a lot that I will eventually want to switch to something else, but there is really nothing else out there that I would want to switch to; whereas with the Bunn I have a lot of different varieties I like and can switch to.
I think a good analogy is the way certain golf clubs have a larger sweet spot than others which allows you to make a good hit more often. In the same way the Bunn has a larger sweet spot than either the Senseo or the Keurig in my opinion.
If Keurig came out with a larger selection of X-bold K-cups in light, medium and dark roast then the Keurig system might win my heart over, but for now the Bunn has my heart; although I cheat on it a little bit with my Keurig, but don't tell my Bunn.