Where each one fits.

Every project on this list has tradeoffs. A check means the feature is in the box at no extra charge. Paid means it exists but costs extra as a separate service. An X means not available.

FeatureIRLEncoderBELABOXLiveU SoloTVU One
Hardware H.264 / H.265 encodeyesyesyesyes
Bonded uplink across modems and ethernetyesyesyesyes
Open transport (SRT / SRTLA, no vendor-only protocol)yesyesnono
Updates with rollbackyesnoyesyes
Live bitrate controlyesyesyesyes
Pick bitrate behaviour per outputyesnonono
Pair a DJI Pocket 3 over Bluetoothyesnonono
Adapt bitrate live (no stream drop)yesyesyesyes
Scenes + PiP overlaysyesnonoyes
Record while streaming (MKV)yesnonopartial
Device UI built from a single APIyesnonono
DIY-buildable from a flashable imageyesyesnono
Pre-built hardware sold by vendornonoyesyes
Cloud relaynoyes, paid add-onyesyes, paid add-on
Cloud remote controlpartialyes, paid add-onyesyes, paid add-on
Works without a subscriptionyesyesnono

On the BELABOX cloud notes

BELABOX cloud provides remote control and relay accounts through the existing UI. The local BELABOX components are open source, and the cloud service is separate from the encoder software.

On the LiveU and TVU rows

Figures based on public product documentation. Both vendors include cloud and remote in the device subscription. Subject to change.