No, the OnePlus 6T does not support 5G.
5G is a technology still evolving right now and there aren't any phone except Samsung Galaxy S10 5G which gives 5G.
Check Full Device Specifications OnePlus 6T
Out of OnePlus 6 and Honor 10 , I will recommend you to go with OnePlus 6 as it offers bigger screen and better processor. You can also check the complete comparison here : OnePlus 6 vs Honor 10
Set up face unlock OnePlus 6 Oxygen OS
Settings > Personal > Security & lock screen > Face unlock > Add face data
I will recommend you OnePlus 6 128GB. It is a stunning smartphone with a big 6.28-inch screen built on an aspect ratio of 19:9. Under the hood is an octa-core Kryo 385 processor works at a good clock speed of 2.5-GHz and is laid on a chipset of Qualcomm Snapdragon 845. You can play extremely high-end games and indulge in multi-tasking with the help of a GPU of Adreno 630 from Qualcomm and a massive 8GB RAM. It is fed with all the energy by a 3,300mAh Li-polymer battery which can be charged up super quickly. The smartphone excels in every department, be it the camera, display or the configuration.
You can also check the complete comparison here: Vivo NEX S vs OnePlus 6 128GB