The A1020 has both Atmos and 4K . I read through the owners manual.
If the 1020 has Atmos and DTSX, I would take the 1020.
The reason is because even if you don't use Atmos, you can still use DTS NeuralX or DSU.
1. Both NeuralX and DSU are so much better than the old Dolby ProLogic II and old DTS Neo6. They make 2Ch sources sound almost like discrete 5.1 sources.
2. DTS NeuralX will make all your sources sound almost like you are watching a Dolby Atmos BluRay!
Even if you don't install Ceiling speakers, you might just want to install small PSB bookshelf speakers on the rear corner wall all the way up to the ceiling level - but still wall mounted. They will be similar to ceiling speakers because they are well above your ear levels.
3. I find that NeuralX and DSU make my 2Ch music sound better than the old SACD and DVD-A music.