The usual feedback is that combo units don't work very well. Devices that are good for flower generally won't give a dab experience. I often, or at least used to, add a small amount of concentrate to flower, that's called "twaxing". It enhances the flower and vapes reasonably cleanly. Most dry herb vapes have no problem with twaxing. The devices most likely to do both effectively are the big PID driven ball vapes. There are desktops like the Ditanium which have a little cup for concentrates, but that's more of a baby dab.
You are probably better off with two separate vapes. Some of the cheapest recommended dry herb vapes are the Starry v4, XMax V3 Pro, POTV One, and the DynaVap B or M models. These aren't the "best" vapes, you don't get cheapest and best together. People who vape for any length of time tend to upgrade from those entry level models.