What is the best wine filtering system?

At 5 gallons a week, you're doing volumes that could justify a Buon Vino Super Jet, especially if you're batching your filtrations so you do four at a time or so.

I've got a long background in wine filtering. Check the following links for more info

General filtering discussion http://www.timvandergrift.com/?p=225

Using the Mini Jet https://www.youtube.com/watch?v=sJcsoHPi0TM

For more winemaking stuff, check out this blog series that I did for a supplier https://www.midwestsupplies.com/blogs/wine-making

Bigger filters https://www.youtube.com/watch?v=yEZ-E9OBSBg

I have a Buon Vino Mini Jet filter, that I bought for about 100$.

I cannot compare it to any other since it is the only one I used so far.
It is for homewinemakers, you buy pad filters that come in 3 different grades (1-coarse, 2-medium, 3-fine).

I find it a bit slow to transfer the wine, but it works. See it in action here: https://www.youtube.com/watch?v=jeohQosn34M

I would seal the carboys temporarily by holding a stopper with two tubes onto them in place with one hand. One of the tubes would extend to the level just above the yeast and the other end just below the stopper. By applying pressure with an air pump or compressed air/co2/n2, you can then push the wine out of the container into an ageing vessel or filter etc. 1-2 psi should be enough for that. You can still use your old filtering method but without lifting the filled carboys.

Like this one here just on a bigger scale: rubber bung with tubes

I would only use pumps before fermentation. Or at least not with small batches of a few gallons. Pumps agitate liquid quite a bit, something I'd like to avoid after fermentation. The pumps I used before also created far too much waste.

For 5 gallons of wine, pumps and power filtration systems are just overkill with far too much maintenance.