FYI: If you like Google TV (aka Android TV), there is a setting in under your account in the Accounts & Profiles settings called Apps Only Mode that turns off most of the ads. It is much more similar to the AppleTV UI with that enabled with just one big ad above the apps.
Which reminds me, Apple added the ability to display ads in the tvOS UI a few versions back. They have stated they have no plans to insert ads "at this time." Hopefully that remains the case.
As for DV support, given how poorly most TVs do at correctly displaying DV content, especially from streaming apps, and the fact that most streaming apps have been adding HDR10+ support, it really doesn't factor into the purchasing decision for me. I don't have any Samsung TVs at present, but I'd totally buy one of their top-end OLEDs given how good the picture is. I might feel different if I was watching a lot of 4K DV Blu-rays, but I am not. If I were to avoid Samsung, it would be for other reasons, such as all the terrible things I hear about Tizen, or why the heck did they put a silver frame around their new flagship OLED than cannot be removed?
Insignia TVs used to be manufactured for Best Buy by Samsung and were good quality, but that hasn't been the case for a while now. The current Insignia TVs are made by the lowest-bidder contract manufacturer and are largely junk.