I just replaced my white deluxe door panels a few weeks ago. There seem to a lot of vendors selling them but it came down to TMI or MM.
I went with the ones from Mustang Market:
http://mustangmarket.net/Mustang/1964-1973%20Mustang/1971%20Mustang/1971%20Mustang%20Door%20Panels/1971%20Mustang%20Deluxe%20Door%20Panels.htm
As mentioned, the ford white is really a cream color and these seem to match my seat covers as well as SEM paint I used to touchup the quarter panels so it cant be that far off.
TMI also sells door panels but are a few $$$ more. Whether that buys better quality, is anyones guess.
The wood grain needs to be moved over to the new panels ( fairly easy ), door handle cups need to be cut out of the new panels ( a little tougher, but MM will do it for you for a little charge ), the pull handle also needs to be moved over. This is fairly straightforward but I wanted a better fit so I trimmed the handles a little with a dremel. Door lock hole needs to be drilled ( somewhat easy ).
The MM panels have foam and vinyl applied to a hard plastic backing which I would guess is easier to shape / cut than a wood backing would be. They also have a metal strip at the top, where it attaches to the door. The door clips seem to line up with clips from the original doors on my car.
MM also has fast shipping. They also have a good return policy if you want to compare a couple of brands and I believe no restocking fee if the panel was not modified i.e. handle cups pre cut for you.
i believe, that all of the items moved to the new panel would still need to be done to the TMI panel. Not many have the handle cups cut out for you or the door lock holes cut.
To say that one is BEST over another is a personal opinion. Some people maybe really picky of the color or grain or have the opinion that the more expensive, the better.
I dunno.. just my observations from having done it for what its worth.
Take your time when doing it with whichever you go with. Feel free to post questions as many have been thru the process.