The subject of the technical differences between the two has been discussed many, many times in the past - but - the reality is either one will functionally work just fine in a real world scenario and like Brian said, take the sales rhetoric out of it and the real world flying capabilities of both are just fine. That being said, I see the D1 as more of a backup for the flight bag...sort of like backup radio, backup GPS, etc.. and not necessarily a perfect candidate for a panel installation as a backup for an IFR panel. Firstly because the price point is such that you'd be just as well off getting a D6 for a TT PFD, secondly you have actual altitude and airspeed.
Don't get me wrong, I quite like the little D1 and think everyone should have one. I've flown it quite a bit now and it's a remarkable piece of equipment - especially for the certified folks. But for homebuilders we have access to the D6 or the TT at around the same price point so I feel that is a better expenditure of your money as an installed product.
All of the aformentioned products are excellent choices so to suggest otherwise would be dubious - you'd be happy with any of them, and any of them should keep the shiny side up in normal flight regimes.
Just my 2 cents as usual!
Cheers,
Stein
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