I've had a Keurig brewer of one type or another for over seven years. I've used different k-cup brewers, different put-your-own-coffee-in adapters for k-cups, and most recently I decided to buy a Vue brewer. Vue pods are not k-cups, but it's what Keurig released after their k-cup patent expired. I also bought an adapter that lets me brew k-cups in the Vue brewer that works well.
For some general considerations, check out
this review that I wrote for a Mr. Coffee branded k-cup brewer. I mostly discuss having an internal heated water reservoir. For convenience, I recommend that because you can brew multiple cups faster once the machine has heated up the water.
K-cups are handier than Vue pods because you can buy them at a lot more places. The Target near me used to carry Vue pods, but no longer - now, I don't know if anyone around me does. I buy them online directly from Keurig, and they end up not being too expensive. K-cups can be found locally, and they are available from multiple brands (because the patent expired).
There are things that I like better about the Vue brewer that I got, and things that I like worse. I think that both types can brew good coffee, assuming that you find a pod that you like.
I know that's not a lot of info, so let me know if you have questions.