I started out at a C-volume GM (later remodeled to PFresh) and have since moved to an A-volume Super. The differences you see will depend on your workcenter. As a GSA, a big challenge for me was changing how I speedweave. At a smaller store with double-stacked lanes, it's easier to see all the cashiers at once and know which lines are shortest. Tougher to do in a Super; sometimes it will back up on one side of the checklanes, while your cashiers on the other side have empty lines. Basket size is another big difference. 1+1 in a GM looks a lot different from 1+1 in a Super. With Supers, you've got a ton of guests who do some serious grocery shopping, which usually takes longer to ring out than general merchandise (entering produce codes, weighing items, bagging cold with cold, meats separate, etc). Full carts of groceries can send the checklanes to a screaching halt.
Not sure what AAs alot regarding TL and ETL count, but here's what we currently have:
15 total TLs (we are 1 over headcount): 2 Hardlines TLs (including 1 Sr), 2.5 Softlines TLs (2 full time and a third who splits her time between Softlines and Pricing), 2 GSTLs, 1 Consumables TL, 1 POG TL, 1 Flow TL, 1 Backroom/Instocks TL, 1 Food Ave TL, 1 Starbucks TL, 1 Deli TL, 1 Perishables TL
8 ETLs (including STL and Rx): STL, ETL-HR, ETL-Log, ETL-Salesfloor, ETL-Food, ETL-GE, ETL-AP, ETL-Rx
If you stay in Electronics though, I doubt you will see a huge difference besides store layout and some longer aisles.