I switched from AA to LAN about a year and a half ago, and now I'm considering whether it was the right call. Any help would be appreciated!

(1) What is your home airport? (SFO, SCL, London LHR, HKG, Singapore SIN etc.)
JFK, occasionally EWR, LGA, BDL.

(2) How many miles do you usually fly each year & in what class? (<25K, 25k-50k, >50k)
60K so far, 70-80K by the end of the year. Always in Economy.

(3) What types of fares do you usually buy ? ( First, Business, Economy etc.)
Economy.

(4) Can you choose your airlines and/or, class of service?. Do you travel for work and/or pleasure?
Get to choose my airlines, not class of service. Although LAN is usually the most convenient way to get to where I'm going.
Travel mostly for work, occasionally for pleasure.

(5) Which routes do you fly most often (US Domestic, Transpacific, Kangaroo, in Asia etc)
4 or 5 trips US to Chile and Peru, 1 or 2 trips to Central America or Argentina.

(6) Do you have FFP status of any kind of OW or other airline at present? What is it? (AA Executive Platinum, QF Gold, UA 1K, LAN Comodoro, etc)
LANPASS Premium Silver
AAdvantage Gold

(7) What is most important to you in a FFP? (upgrades on travel, priority services when flying the airline, extra baggage allowance, good award redemption rates, better award access, free - discounted lounge access, etc.)
Ranked in order of importance:
Upgrades on travel.
Good award redemption rates.
Free - discounted lounge access.
All the rest.

(8) Preferred Airlines
LAN, AA.

Thank you!