I go with the T-10 since it quite manoeuvrable in normal space compared the the T-9.
It's a mining ship, not a ballet dancer.
My Type-9 hits a massive 70 in normal space, full throttle. I can push it all the way to 72 if use the forward thrusters while I move.
It feels like I'm flying a full-sized mining operation around... oh, wait, I am flying a full-sized mining operation around.
And with 640 Tons of space inside, 5 Collectors, 2 Prospectors and even a Repair Limpet (for those times I try to squeeze between rocks and it's doesn't go as planned).
It's a glorious sight to behold!
And for mining? Two turret-mounted medium mining lasers, 2 fixed Mining Lances.
And before you say "You don't need that many mining beams...", yes I do, and here's why:
1. Multi-crew. One person can man the turrets, I can use the lances, and we can strip two rocks at a time.
2. Mining Lasers have a 500m range. Mining Lances have a 2 km range. My prospectors are good up to around 3 km, so I can scout my rocks, close in on the one(s) I want, start stripping with the lances, and by the time I'm within 500 m, I've got that rock down to around 50%. If I use both together, it is actually faster than just the medium beams or the lances alone, but it does build heat pretty fast - of course, that last 50% is usually stripped off before I actually overheat.