You’re putting the cart before the horse. Don’t waste your energy and time contemplating this question. Wait until you’ve received acceptances. This question may be moot. MIT is much more selective and its applicant pool is also overall stronger. Did you apply early to either or both schools? If you applied to Rice early and is accepted, it will be decided for you as its early program is binding. If you didn’t, you should apply to both RD, if they’re your top and 2nd choices respectively.