From small to big.
1. DJI Osmo Pocket
2. Action Cam with gimbal
3. Phone with gimbal
4. 4/3 with gimbal (Lumix G7 / G85 series as an example)
5. Full DSLR with gimbal
If you don't want too much attention, go with 1 or 2.
If you have a small budget, but already a good phone, go with 3.
If you want best quality go with 4 or 5. (5 for nighttime).