I really like ib's mobile platform. In fact I dont know last time I actually loaded TWS up on my laptop. Very quick and easy to put spreads together. I haven't checked out tastyworks yet, but their product selection does not compare to ib at this time. As far as commission cost I really don't know for sure I don't pay too much attention to it I just know they are very competitive but in the Forum Kim mentioned are a few other options that would save you money in this regard