Will be flying a long haul from Houston to Sydney Australia with a 1 year old. Trying to decide whether we want to be in bulkhead or in a regular economy plus seat. We would be flying United on a 787-9 Dreamliner.

Pros for bulkhead: more space, kid can sit on the floor and play
Cons for bulkhead: armrests dont move, width of seats is slightly smaller

Pros for regular econ+: can lift the arm rests
Cons: Not sure if there would be floor space.

Anyone have thoughts on these options?