Command time on the 737NG will be well regarded by Emirates and give you the edge over those without it.
Second to that would be the F/O job on the 757.
Business jets don`t really interest most airlines greatly. It may be unfair given that they are quite technologically advanced these days however the general view of recruitment departments is that any bsiness operation is going to provide less demanding training and less adherence to Standard Operating procedures.
With the current world situation being as it is, there is a huge surplus still of guys with airline experience. Command time will give you the edge you may require.