I've grown two varieties now for a good decade.
Groninger. Can sow right up to May, harvest from late October to February. Each plant produces heavy yields of medium to large sprouts over a long period as have a long sowing period from Feb to May.
Crispus F1. These also crop well, are medium sprouts. You get an earlier crop from late September to late December. They do pop in January, so you need to pick them by end December.
Only problems I find with Brussels Sprouts are the cabbage white, but I have use my cabbage white dummies for the last few years and not had any problems.
I've tried a few other sprouts over the years along with my favourites above, but all have been disappointing.
Found Evesham to be be a good tasting sprout, but were small plants, so not the greatest yield.
Camelot were a complete failure and produced more tops than sprouts and were not very tight sprouts as if they all blew on growing.
The worst I tried were Windsor, they produced very small yield per plant and small to medium sprouts on small plants and were over sweet.