Re: Which has more room
If you are to compare the Early Bronco to the Jeep.
The jeep has more vertical space (the seats are more upright), the bronco seats sit more like a car than the jeep. The back of the Bronco is slightly longer and wider but, again has less vertical space. Overall, the Bronco is a little larger on the inside.
You also mentioned the Late Bronco which has way more room than both the Early Bronco and the Jeep. It is approx 12" wider, 24" longer and 12" taller on the interior than the early Bronco. It is a hulk in comparison.
I am 6'-4" tall and find that the Early and Late model Broncos are very comfortable. Two of my neighbors have jeeps, and they are a little uncomfortable for a resonably tall person with the stock seat configuration.
Just my 2 cents.