Hi Paco,
The 702/788t series pres will outperform the 633 pres for that use. I love my 633, It truly is a powerhouse mixer / recorder in production sound for capturing dialogue but not the best choice for music recording when compared to the 7 series.
My reasoning is the noise floor on the 633 will show up a lot sooner. I know this from real world testing and most importantly playing back in the studio monitors. Also the 633 may sound a bit bright, and not as warm and full as the 702/788t. But of course the sound of the pre is subjective to each person, but the signal to noise performace is not.