and tosafos? and the maharsha? where does it end
come on, who you kidding. When's the last time you heard someone make a mistake if rashi or tosafos said the pshat or if it was the gemara. Theres no comparison between rishonim which were written with ruach hakodesh and achrei achronim. Dirshu is not a pirush to understand the mb but rishonim help you understand the gemara better. Another difference is the mishna beruras not from too long ago and when you put other poskim right next to it, it could get you mixed up, and I have heard many mix ups recently. Thats all.