Hi.
Ehem are the Rolls Royce of filters, doing exactly what they say on the can and lasting years doing the job they are designed to do. IMO, the new Fluvals are also good. The old fluvals were the cheep s$$t of the filtration world, and preformed as such. However, the new fluvals IMO are changing the companies doggy past. However, the new fluvals have not been arround long enough to have a full jundgement passed over long tearm reliability. Ehem would be the safest bet, but IMO, Fluval are now getting better, and may be worth the risk if you are working on a budget.
HTH
rabbut