We have the Roku 3 and the Fire TV on our 4k TV and an older roku 2 and the $40 Fire stick on our smaller 720p set. We can get DTVN using either Roku but only when we use the Fire stick can we get all the features on DTVN. The DTVN’s DVR doesn’t appear on either Roku but does when we use the Fire. The video on both TV’s also seems sharper on the Fire. If you need to upgrade, I would keep the Roku you have so you can get the Roku TV channel and get a newer Fire stick ($40 or $50 for the 4K model)to use with HDTVN. It gives you additional stuff and flexibility.
Great info. I wondered how the well the fire stick worked. My son wants the dvr, so it would have been disappointing if it hadn’t worked. I think I’ll take your advice and get thanks fire stick instead. Thanks!