7 watts doesn't have to compete with 150 watts, you get to pick one and play through it. Either each one performs to your needs or it doesn't. You wouldn't have to turn the 150 watt one all the way up.
Roland make a number of Cube models. I looked up the 6.5" speaker model, a battery powered unit. It produces 5 watts, not 30. There is a Roland Cube 30 watt with a 10 inch speaker.
All three have both microphone and guitar inputs. The Behringer is not battery operated, it needs to plug into the wall. That may or may not be an issue for you.
You find these suited to you? Have you done more than read about them? I highly recommend you listen to them if possible. See if any sound better than others, and maybe get a feel for using the controls. For example, the Behringer has extra features. It has an MP3 player and a USB out for making recordings on a computer.
If it sounds good to you, then it is good. I can't tell you what it ought to sound like. My own opinion is I think battery amps are suited to busking and small outdoor practicing. There are nice sounding tiny speakers, but for me a 10 or 12 inch just sounds better. But give then a listen and see. I am sure there are music stores in Buffalo, at least when they are not covered with snow.
For similar money, here is an example of a powered speaker, yes it has way more power than you need, but don't turn it up. It has a basic mixer so you can plug both mic and guitar into it. Maybe you don't want anything that physically large.
Features? It may or may not matter to you, but I think the digital effects are more sophisticated on the Behringer, and maybe less so on the Fender. You won't like most of them probably, but having a touch of reverb livens up any vocal. I don't like super dry vocals myself. And you can't do a good cover of the Nilsson tune Jump Into The Fire without a good repeat effect.
For nursing homes, are you sure you even need an amplifier? Is your guitar an acoustic, or electric? I live in an old folks home myself and I can stand in front of our group in the community room and be heard no problem. Outdoors is harder to fill with sound. But for small gigs like social rooms or homes like mine an amp need not be powerful.