I've been on both since 2001. I, like many others on the DT forum, have opted out of receiving the real time emails or even the daily digest, and I follow it all through the archives which are posted in just about real time. If I see a post needing a reply, it is easy enough to do by just opening another window.
The PIBB has grown a LOT in recent months and is far more interesting than say a couple of years ago. I enjoy the picture posting abilities, the varied subjects so if you are not interested in mangustas or sexual harassment issues you can pick and choose.
I enjoy both for the information shared and De Tomaso Family brotherhood shown.
I think if you are on just one, you are missing out on worthwhile postings, people and knowledge.
Larry (who has pissed off folks on BOTH sites , and made a few friends, too )
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