Independent mechanics don't know everything about every part they install. Let's assume an authorized Ferrari dealer would use Ferrari filters.
Don't minimize the effects of marketing and easy availability. When a car comes in for an oil change, even a Ferrari...the parts either need to be on hand or easily available from whoever supplies the parts to the shop. Advantage: Fram.
Fram isn't a "Bad" filter...although if you tear one apart...go ahead, for 3 bucks at WalMart knock yourself out....and maybe get an equivalent Motorcraft for comparison... you'll be really surprised at the differences. Why would anyone tolerate less, uneven pleats, card board end caps, a nitrile ADBV, and a flimsy spring?
Also, with regard to Purolator, until they resolve (or even acknowledge) the media tear issue, they shouldn't be used, especially given the higher revving, thicker oil conditions of Alfas in general. Torn media cannot filter oil.
There are a lot of guys who post vids on YouTube of cut open filters (before and after use), there are a lot of independent labs who test filters for efficiency and flow rate and such...if you're in doubt, the data is out there.