Simply, Tile uses bluetooth and crowd tracking which means if your tile device is not within 100 ft (30ft for best results) from your phone or another person with the tile app's phone, it will not track its location. Also if your tile device is out of range you have to wait for someone with the tile app to be within 100ft (30ft for best results) for your device's last know location to show up.
Remora Tracking uses a cellular signal to transmit your location data. This means your Remora Device can be halfway around the world from the person tracking it and it will still give you a precise location. If your Item with a Remora Device attached becomes lost, you never have to wait for someone else to find it. Simply log onto the Remora Website or open your Remora App, view your device on a google map and watch where it is going in real time.
Although there are many other differences these are the main difference.