Like others have said, Pellet works all year round. I'm finding Pellet is still dominating on a lot of venues I've fished whereas maggot doesn't seem to be competing as well. I'd say another few weeks to a month and we'll see a major shift in maggot.
I catch on pellet year round. But you need to have a variety of baits in Winter and cycle through them to find what the fish want. Winter I take 2 & 4 mm pellet, Summer 4 & 6. I normally only take maggot & pinkie in Winter.