I posted a related question in the FB forum, but this looks like the place to get more general advice -- I hope this won't be considered a double- or cross-post, I'd hate to breach etiquette on my second day here....

1. What is most important to you in a frequent flyer program (FFP)?
(e.g., upgrades, priority services, baggage allowance, good award redemption rates, better award access, lounge access)
Reply:

Priority services, lounge access, and award access.

2. How many miles do you usually fly each year? How many flights/sectors?
(e.g., <25000, 25000-50000, >50000 miles and <25, 25-50, >50 flights?)
Reply:

Last year I flew about 125,000 miles spread over roughly 25 segments. I'm on track for something similar this year.

3. What fare class do you usually buy?
(e.g., first, business, premium economy, economy)
Reply:

Business on segments >3 hrs and fully refundable economy on segments <3 hrs when traveling for work. About 90% of these segments are long-haul in business. Personal travel is in economy or using award tickets.

4. Are you able to choose your airlines and/or class of service? Do you travel for work and/or pleasure?
Reply:

For work travel, I have some control over airlines, but if an AF-marketed option is available the corporate TA will almost always choose it. The exception is when AF doesn't fly a route or another flight is significantly cheaper, but then it will always be a non-SkyTeam airline.

Personal travel tends to be on award tickets or discount airlines like EasyJet, WizzAir, and Ryanair.

5. Which routes do you fly most often
(e.g., U.S. domestic, transatlantic, intra-Asia)
Reply:

Transatlantic 6-10 times/year (typically CDG-SFO, occasionally open jaws out of CDG), CDG to Asia 1-2 times/year, domestic European 1-4 times/year.

6. What is your home airport?
(e.g., SFO, LHR, HKG)
Reply:

CDG

7. Do you have status in any FFP? What is it? How miles do you have banked in a FFP, if any?
(e.g., AA Executive Platinum, UA 1K, LAN Comodoro)
Reply:

Skymiles Diamond (300k miles), Miles & More (33k miles, 25k status miles)

8. What are your preferred airlines, if any?
Reply:

The vast majority of my miles are flown on AF and, as mentioned above, I have little say in the matter. Most of the remaining miles are split fairly evenly between DL and UA. The DL flights tend to be US domestic, while the UA flights tend to be long-haul transatlantic.

I anticipate flying within Asia in the coming years, and it looks like China Southern, China Eastern, China Airlines, Malaysian Airlines, and/or Philippines are likely candidates for those flights.