I use a Fuji XT3 with an 8-16 f2.8 and 16-60 f4 and 23 f1.4 primarily for exploring. Then 80mm macro and 70-300. I then have several vintage lenses with adaptors.
I've still got my old Canon EOS700D, mainly use the 10-
18mm wide angle or my 50mm. Its getting a bit outdated, but still does the job. Also have a few others if something is a bit further away.
Canon 80d with a array of prime lenses. I do use a 10-18mm too but I find the prime lenses really enjoyable to use, especially my 24mm. Nice and sharp too and actually surprisingly usable even in the small spaces we often find ourselves in.
I use a D3200 with a Sigma 10-20mm lens. Not idea if its the best but they are cheap enough that its not the end of the world if it gets smashed up underground
I've used my second hand d3200 for years for hobby photography and it's always held up. Used the 18-55mm kit lens most of the time but recently bought myself a 30mm prime lens and a 200mm telescopic and this combo of lenses can handle basically anything. 30mm Prime especially gets used more than you'd think because while yes the 18-55 can function at 30mm, the prime is very fast so it's great for low light.