Both are very good canister filters and Eheim has a good reputation.
I personally would go with the 2229, I've been eyeing this filter for when I get my 100 - 125 gal
This is a great wet-dry filter and will provide excellent biological filtration, better than the 2028 IMO
There are IMO
only two pro's-n-cons between the two, as the 2028 seems to have better chemical filtration capabilities if needed and the 2229 better biological, while both do a great job at mechanical filtration.
I believe in multiple filters and I would go with the 2229 and let my two AC500 HOB
power filters (modified with bio-wheels 8O ) take up the slack as I can fill them with whatever filtration media (chemical) I could possibly need
Do shop around for your 2229, I found'em for as low as $200. on E-bay, brand spanking new, with shipping only $15. its a sweet deal.
Fosters and Smith was less exspensive than Big-al's but i didn't compare shipping cost.... Shop, shop, shop.........