Sherman, thanks for the clarification, but I confess to still being somewhat confused . . . with any spouted (
i.e.: non-bottomless) portafilter
*, there will always be a "bend" to the coffee flow -- even if your two examples, the espresso drops straight down, and is then directed through the spouts at an angle. My single-spouted portafilters (both for the Elektra and the La Valentina) are like this. With the type of double spouts I have, I agree that there is an "extra" turn in the flow of espresso -- straight down through the screw hold/fitting, then a 90-degree angle to the spouts, then another turn as it flows through the spouts (open/closed makes no difference).
I was thinking of the ease of using a brush or pipe cleaner (if necessary) to clean the path of the espresso after a routine maintenance weekly soak in Joe Glo/Caffiza/Puro Caff, etc. An open spout design is easier to get "into" than a closed one (plus, as I said earlier, I find it more aesthetically pleasing). But most of hte time, I find no need -- a "test" with a pipe cleaner comes out clean after the soak.
My old Gaggia portafilter didn't even have a spout -- just two holes in the bottom.
Cheers,
Jason
* With the possible exception of the "straight drop" spout shown in a previous post
here.