Aerolopa is correct. 17ABCDEF, 18/19 DEF are MCE in that mid section. 18/19ABC are standard. Why, you ask? If you look at the Aerolopa seat map back to the lav, you'll see why. Also, if you're ok with exit row, take 17. It has some additional legroom over the other MCE seats.
If rows 8-10 are available, they're no different than 18/19, but 8 does not have a hard bulkhead so you will be able to stow carryons under the First class seat ahead of you.
Thanks. Unfortunately, rows 8 to 10 are taken. I have kids with me, so row 17, exit row is out. Only 18/19DEF are open. I have row 20ACDF, with empty middle seats for now. I am thinking of getting 18DF and 19DF, hoping for an empty middle seat.