I've found most brands of vegetarian and vegan mince to be pretty good. I'd say the fresh (chilled) products seem to be better overall, but the frozen ones offer a more convenient option. We always try to keep a version of frozen mince in the freezer just in case we fancy some and didn't pick a fresh one up in the weekly shop. I'd add a note to say that with the chilled options, make sure you don't undercook it because you may end up with a mushy consistency - we tend to cook for longer than the suggested timings.
Overall I'd say there's not much difference between them all, therefore I've given them all the same score for now (I may revise this at a later date). They are all good.
Quorn: Mince - ⭐⭐⭐⭐✰ (not vegan)
Frozen / 300g or 500g (chilled version also available)
This is a really nice mince, but sadly it is not vegan.
Plant Pioneers (Sainsburys): No Meat Mince - ⭐⭐⭐⭐✰
Frozen / 500g
Another nice frozen option. Made from textured soya protein pieces. This is the one we always try to have on hand in case we fancy something unplanned. This one is vegan, so we tend to pick this in favour of the Quorn frozen option above.
Please note: There is a Plant Pioneers No Meat Mince chilled option, but it has a completely different recipe - that one is made from mushrooms and seitan. I haven't tried it yet, but I'll add it when I do.
Meatless Farm: Plant-based Mince - ⭐⭐⭐⭐✰
Chilled / 400g
This is one of the chilled versions that we regularly buy. It's very nice and seems to have a slight edge over the frozen options. Just make sure you don't undercook it.
Richmond: No Beef Mince - ⭐⭐⭐⭐✰
Chilled / 300g
This one may have a slightly porky flavour to it (I need to test again to be sure). However it is pretty decent.
I have tried more, but I'll add them at a later date.