Hi Aspirant,
Either being a successful architect or an IITian,both shall result in you getting a handsome package from the employer.
However,This answer totally depends on your choice.
If you are interested in Architecture,you'll find your life being the best if you follow it.
Moreover,if you aren't interested in Architecture and you like engineering,then IIT is where you'll find happiness in.
Make sure,that you follow your interest and your passion.Do not hesitate in going for what you like because that will help you in the future.
Hope this helps.