I did things a little different this year for my fall seeds. I decided what I wanted to grow and then decided on preferred varieties. Then I did an online search for those varieties to see who had them. Three names kept popping up, Baker Creek, Burpee, and Territorial.
So I went to each site and looked through their varieties and for everything I wanted I wrote down what my variety would be if I ordered from them, cost, and how many seeds per packet. Baker Creek was sold out of a lot of stuff and I was surprised that their cost comparison wasn't very good on what they had. Burpee seed packets are a lot bigger than I normally need so their costs weren't great but they were also sold out of a lot. Territorial came out the clear winner for my criteria so they got my order.
Never heard of Territorial so I'm bookmarking their site for later browsing, they look like they have a nice selection of various items and I love thinking ahead, even 2-3 years down the line.

I do tend to favor Baker Creek because I enjoy having easy access to reviews (which I add to myself) and they offer free shipping. Plus the fat catalog is a nice surprise in fall/winter, I flip through it and then pass it on to my mother in law.

I also just placed an order with "Totally Tomatoes" to get the last few things I was missing for 2021 (more tomatoes, radishes) - don't know anything about the company but they had the last couple of seeds I was looking for, so figure I'd give them a shot.