FlyerTalk Evangelist
Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: BA Silver, TK E+, AA PP, Hyatt Globalist, Marriott LT Plat, Hilton Diamond
Posts: 13,045
FWIW TK miles have a hard expiry. So unless you put some effort into it, they won't be worth anything to you anyhow.
For me the question wouldn't be "what miles should I collect for a certain fare class" but instead... "am I willing to pay more for a higher fare class that gives me more miles in my preferred programme."