I have the Stock Seat, The solo seat, and the Corbin Gunfighter made for the 97-98 TBird which I modified.
The Solo is by far the best looking.
The Corbin looks good also and is by far the most comfortable although it sits you way back (at least three inches over stock).
The Solo is hard. Has about a half inch of foam between you and the seat pan. I do not find it unfomfortable. With just the bare seat I like it much more than stock. With a beaded seat covered by a sheep skin on the stock it is as comfortable as the solo.
Also, it is not an either or thing unless you bob the rear fender. I can go from either Corbin or Solo to the stock seat with Sissybar and Luggage Rack in about 15 minutes.
Photo of bike with Solo Seat -
http://vrcc.photostash.com/vrcc_11678/TBS.jpg
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