You know when it's all said and done...I think the most important thing is a good instructor (hopefully you'll find that), glass or round... cessna or piper... whatever it is a good instructor will be able to lead you in a good direction for your career.
The initial instrument is one of the most important ratings you'll get. Partially....of course.. I'd go with the rounds.... my full advice would be to also get your tailwheel endorsement, and do a good bit of upset training/spin/aerobatics in a citabria or decathlon if you can find one for a decent deal. Good stick skills are starting to be few and far between in the airline industry... you should also try to enjoy this part of your career as much as possible.