The simplest most reliable IMHO is the pleated filter type. I make my own for about $12. The UAT's can be a real pain to get all of the air purged out of the filter sock. I had several aborted take offs before I got mine sorted out. A friend had a couple flame outs in the air before he got his completely purged. After going through the purging/shaking routine the UAT works very well. If you drain the fuel out of the UAT you have to re-purge. The Hanson one would have the same concern, the issue mentioned about the Festo fitting, plus the extra micron filter might be more than what is required. I have no experience with it but if too fine a filter is used it would be prone to plugging easily.

With the pleated type you just connect it and it works.

Joe