Cascalog deffilterop vs pure clojure

Cascalog deffilterop vs pure clojure

Is there a difference, performance or otherwise, between using a
deffilterop and using a purse clojure function?
http://nathanmarz.com/blog/introducing-cascalog-a-clojure-based-query-language-for-hado.html
mentions that filtering can be done with clojure functions like (< ?age2
?age1) however looking at
https://github.com/nathanmarz/cascalog/wiki/Guide-to-custom-operations it
looks like you can define a function like (deffilterop is-2? [x] (= x 2)).
So my question is, is there any difference between these two approaches
and if not which is the preferred syntax?
Note: It also looks like all of the defxxxop functions are being
deprecated for defxxxfn instead.
https://github.com/nathanmarz/cascalog/blob/develop/cascalog-core/src/clj/cascalog/logic/def.clj#L131