Add some pictures and my thoughts for your reference. Hope it's not too late.

JFK-ANC-TPE v.v. (Three weekly flights) usually operates by old 744, which means you will have sleeper style F.

I personally don't hate sleeper style seat because it still can be 180 degree flat bed. Also, the seat is very soft. But, the IFE system is lame for sure. If you don't care about IFE, you will be fine.

LAX-TPE v.v. (Two daily flights) majorly operated by new 744, which means you will have suite style F.

I love this one. No one says "excuse me" to you, or you don't need to say "excuse me" to your seatmate when intending to use restroom. You have your own space. The IFE is good. 15" PTV with AVOD system. AC power is also available.

Business Class on old 744 is not that bad but definetely outdated.
http://www.china-airlines.com/en/check/service-4-02.htm
Btw, the old style C is very soft. Although the seat relining only has 130 degrees, I feel it really treats me well on long-haul flight.

Business Class on new 744 just simply makes me LOL even CI has remodified them to 60" seat pitch with 140 degree reclining. (It's the same seat, but originally only have 48" seat pitch with 120 degree reclining.)
http://www.china-airlines.com/en/che...ice-4-02_b.htm