I’ve noticed a much heavier use of minor keys in trip hop than lofi or chill. Tempo might match, some of the techniques might match, but that minor key changes the feel entirely. Takes you right into that dark trippy place that I love so much.

It's more jazzy and relax in general. It's usually slow. It's quite good to work.

Lofi is great, and sits in the triphop universe. Check out some early Bonobo for instance

Though they definitely share production methods and tone and meter, TripHop is traditionally used when the artist is being experimental with form and and tone, often within the confines of a single track. There might even be a structure resembling verses and choruses.

LoFi/Chillhop is more along the lines of Ambient, with much less overall variation of tone/structures during the track or between tracks.

BPM. Massive Attack has fast undertones, etc.