Let me swing by with our knucklehead and let you take him for a spin for a couple of days, then you can tell me how much "fun" it is.

Having a dog smart enough to quickly pick up commands and the energy/athleticism to go balls out on hikes, or doing laps, or agility training is great. Having a dog smart enough to realize that if he is obstinate for long enough his "mother" will give in out of sheer frustration is less great.
First time owner? My advice would bet this: Be honest with yourself. If you think you want a high energy dog, go about two notches lower on the energy meter as you honestly think you can handle. Would rather wind up with a dog who had a little bit of a governor on the engine than to find out I had just rescued the "Buggati of dogs" if I knew I was more of a "Subaru of people" kinda individual.
Not fair to the dog either if you rescued, say, a boxer or some kind of herder that
need to "work" every day to not be total spazzes.
Beagles are great dogs (aside from sometimes being kinda smelly if you don't keep up with it). I grew up with tons of them(both as hunting dogs and pets) and almost universally they were good dogs. Barking isn't really the problem with them in my experience. It's the howling. At any time of day, with zero warning. That and the inability to ignore their nose for even a nanosecond. Will follow that thing to the next county if they pick up something they think is interesting.
Awesome dogs though. Sweet nature. Pretty chill as they age. Can be pretty stubborn however, due to the nose. It really does rule their world, but you can deal if you realize that going in. If I ever get another dog it will probably be a beagle.