I'm only going to make a suggestion.I leave it up to you to decide.I would recommend purchasing an HTC U11 from HTC if you need a flagship phone A.S.A.P. However,their website is unclear why the front page says 549.99 for the 64GB model,but when you add the phone to the cart,it still says and insist it's 649.99 launch price.So until HTC gets things straightened out,I'd suggest purchasing it from Swappa.
Know that an unlocked U11 will work with HD Voice turned on with your Verizon Account.Without it,your LTE data will work fine,but you won't be able to make or receive phone calls as the U11 and U12+ do not have a 2G CDMA antenna.
I went though all this pain last July when I tried using a U11 with Total Wireless that uses Verizon's network.I went a week without a working phone number until I switched back out after I discovered Total Wireless doesn't support HD Voice or (Voice Over LTE") yet.
All the quirks and problems with the U11 are known now. If you wait for the U12+,you'll be in the test phase to find out all the problems.With my year of experience,I'd insist a case protector for the U11 is not optional.A suggestion from another user is the Evocel.https://www.amazon.com/Evocel-Generation-Holster-Kickstand-EVO-HTCU11-XX12/dp/B073DHH5T1
As far as Swappa goes,you are buying directly from a person.You have the option to haggle their asking price.You want to ask what accessories are included and condition.Make sure it comes with the USB C to 3.5mm adapter is included.