Well yes.... but.....
The convertibles are very nice when the weather's good enough for topless motoring (no smut at the back - you know what I mean) and ok for pottering about with the top up. They are noisy at speed though (and very noisy at higher speed), a little dark inside and not particularly waterproof.
The saloons have a wonderfully light and airy cabin (considering it's only a little car after all), are quieter at speed and usually fairly waterproof. The roof does come off as well and getting it off is pretty quick and easy for two people. Putting it back properly, a bit less so, but still not that much worse than fitting a Spitfire or Stag hardtop. The catch comes when it rains and you've left your roof at the campsite, 30 miles away......
The saloons have a bit more back seat space but still hardly generous, or even sufficient for a full-grown human.
On my project list (though a little way down) is making a hardtop for my Vitesse from a saloon roof. I have a Honeybourne roof, but I don't much like it.