Welcome back to the hobby!
I envy you having a tank that large.
I agree with the others that it's hard to go wrong with more filtration. I have an AC
50 and an AC
20 on my planted 20-long, and I haven't regretted it: the water is in great shape. Since you're looking at Fluval, you might consider the 406 canister. It's rated for 100 gallons and should do a great job on your tank.
Now open: "JJ&J's Seafood Buffet
" 20g long planted freshwater - Sunset Fire Platy (x5 adults, many young (argh)),Neon Tetras (x11), x3 amano shrimp, 40 lbs. Eco-Complete, AC 50 + AC 20, Finnex Planted+ 8 hours per day, Seachem ferts.