The only thing I like the Hot Mag for is its convenience if used exclusively for carbon with a carbon sponge sleeve. So it can be installed or removed between tank medications.
But when it comes to polishing I count on the GPH force of the FX5 pressurized canister to force water through my customized poly quilt inserts that last a long time between cleanings.
Sumps are OK but for fresh water are still hampered IMO by a skimmer that serves no purpose but to limits its ability to remove suspended particles while at the same time interfere with floating food. Also in spite of the fact that I could buy a 1000 GPH pump for my PS4 sump the GPH is always limited by the gravity feed 1 inch return tube which can only pass 300-350 GPH because draining gravity limits its ability whereas a pressurized canister can pass significantly more water or true GPH (FX5). I know now why most reefs use two overflows and why they oar so oversize to manage gravity flow which is limited without pressure.
The one thing I really like about my PS4 sump is the auto fill which makes adding water to a tank the size of 244 gallons so much easier for me. But I find that with a little forethought the FX5 is no more difficult to treat as an in place filter with on the spot removable media, then a sump. However the FX5 has that sediment drain to clean the bottom out when it gets dirty, you just have to get the hang of it and change the mind set that the FX5 needs to move to the sink, no so.
However the sump wet/dry has one great advantage and that is economics one could make with just a $30 pond pump some hardware hose and Rubbermaid containers an adequate sump filter for a 100 gallon aquarium with only about $100 with new parts or even less with whats around the house. In that respect the sumps a winner in my book.
But my favorite all time filter is still the Magnum 350 becasue of its sheer small size to large footprint capacity due to its circumference design makes it a truly the most affordable (under $100), size to capacity filter on the market for aquariums as large as 100 gallons. Still the most impressive filter in my book due to its simplicity, compact size and disproportional large capability. Quite simply a little engineering marvel and with over 20 years of history to prove it, its a legend in its own time.