I purchased both of these pots at the same time (Keurig here on Amazon and the FlexBrew from our local big-box store). Here is my analysis:Things these two share in common:* They make great coffee!* They both make a carafe or a single serving with a K-cup or with your own grounds in a k-cup adapter.* They both make a carafe with up to 12 cups, or 60 oz (you lose some fluid in the brew process, achieving more like 56 to 57 oz).* They are both programmable for an auto-brew.* They both have an option for strong/bold coffee and the option applies to both the carafe and the single-serving side.Keurig K-Duo Plus pros:* Attractive.* Small footprint good for smaller kitchens.* Has a reservoir to hold water for multiple cups.* Comes with a thermal carafe.* Comes with a gold filter and water filter.* Has easy-to-read push buttons for size options.* Carafe and single cup options come out of the same spout - less cleaning involved.* Fast brew process.* Little to no steam escaping the top, so it seems safe to place under cabinets. And because of the separate removable reservoir, it can be used just fine beneath cabinets without pulling it out to fill.Keurig K-Duo Plus cons:* Expensive.* Size options limited. For a carafe, you can choose 6, 8, 10, or 12 cups. For a single cup, you have the same choices (in ounces). There are no in-between sizes, and the maximum K-cup size you can make is 12 oz.* Coffee filter basket is a bit hard to pull out and push back in.* Gold filter does not have a handle.* To use a "My K-cup" adapter with your own grounds requires fully pulling out the coffee basket, reaching up inside, and popping out the piece that punctures the K-cup. So switching between K-cups and your own grounds for a single brew is super cumbersome.* Does not include a "My K-cup" adapter for your own grounds. That must be purchased separately.* Height is quite tall and it can be difficult to see the button controls if your cabinets are low or cast a shadow. Could be difficult to insert a K-cup for some.Hamilton Beach FlexBrew pros:* MUCH more affordable.* Less buttons to push as water output is based upon how much water you put in at the time of brewing.* Single serving side will do up to 14 ounces.* Single serving size is dependent upon how much water you put in, thus making the size more customizable - so you can do a small espresso cup, for example, with only 4 ounces.* Carafe sizes are also customizable up to 12 cups, based upon how much water your put in.* Slightly shorter than the Keurig.* Includes a mesh filter for the single-serving side, for using your own grounds.* Storage for the single-serving mesh filter is beneath the single-serving drip tray which is quite handy.* Coffee is really hot, so you can add liquid creamer and not feel like you have to microwave it.Hamilton FlexBrew cons:* Not as attractive as the Keurig. Bulkier.* Does NOT include a gold filter. That must be purchased separately.* Does not have a reservoir that stays filled and ready to go. It must be filled each time you brew.* Takes longer to brew than the Keurig.* Two separate spouts for carafe and for single serving. Therefore, two spouts that need cleaning/descaling.* No thermal carafe included (They have that as another model, but it only does 10 cups).* More difficult to fill the reservoirs since they are at the back of the machine. If placing this beneath cabinets, one would probably need to pull the machine out when using in order to reach and fill the reservoirs.Final decision: in the end, I went for the FlexBrew, as I decided I preferred the ability to make up to 14 ounces on the single-serving side, so it fully fills my cup. While the instructions say not to exceed 10 ounces for actual K-cups, I have been putting in 14 ounces, selecting the bold brew, and it seems to work just fine. I also like that it's easy to switch between K-cups and using your own grounds on the single-serving side. Plus, there's storage for the mesh filter right on the pot, so I don't have to go searching for the accessory. The better price tag is a big factor too, of course. I did end up buying a gold filter and a separate thermal carafe for those days when needed, although we usually drink the full carafe pretty quickly. Even with the purchase of the thermal carafe and gold filter, the price tag on this is still significantly less than the Keurig. I didn't need to place this beneath a cabinet, so that issue wasn't significant for me. If you need yours beneath a cabinet, I would probably recommend the Keurig.