Everyone has their own opinion. A thought that may work is the following... bid the -200 for quicker movement in base/seat. QOL is huge and you will make far more money (net) with a line on the -200 vs the -900. So get on the -200, get to the base you want, then watch the line awards until you can hold a similar QOL on the -900, at that point swap over, then upgrade with the same thought process.