IMHO, there's nothing wrong with 4 doors.
Actually, i like them a lot and they are definitely stronger body wise than 2 door hard tops.
However, a lot of people still hate them and call them ugly, non performance, grandma cars, etc.
That's why they will probably never be worth much compared to the 2 doors and would be harder to sell even if the 2 door is rough and the 4 door is in much better condition.
Fix it up as an enthusiast and enjoy it, you will have a lot of fun!
And isn't that what it's all about?