It depends on the application. I liked having separate radios when I started out (and kinda still do) because it was nice to be able to talk to local friends to help me troubleshoot new station or HF setup problems.
On the other hand, once you've been around the hobby for a while, you might find places where you want one radio to bring and setup quickly like a go box or in a second location like a camper, a cabin, or a second location in your home.