first off, i know this is an old thread and i dont even know if anybody will read this or not...but im gonna say sasori would own mukade. im not speaking from bias and i JUST finished watching the lost tower movie. i say sasori would win and heres why:
mukade does have the "unlimited chakra" but thats thanks to the ryumyaku tower thing. it is pretty crazy and all but being a class S ninja, sasori would be clever enough to figure what the source of his power would be. stopping it wouldnt be a problem either because he will take the battle there, split his puppets 50 / 50, disable the ryumyaku with one half and distract with the other. It seems that the ryumyaku chakra pool would be unstable if an explosion were to happen. Sasori would surely have some explosive tags on one of his puppets.
mukade can control a considerable amount of "puppets", but again, it was thanks to the ryumyaku and im going to assume that making puppets just wave and cheer wouldnt be too much work for a puppet user. Mukade also had chakra channels that he would use to spread his chakra farther. If sasori had that, im sure he can control a nation. Mukade's puppets were strong, but not near any level of a "human puppet". Human puppets have kekkei genkai and they themselves have chakra and abilities. in the anime, it is shown that sasori even has an uchiha puppet in one of his 100 puppets technique. mukade's puppets are also too slow to match up with sasori's speed and technique.
mukade's true form AND his big huge ultimate form would be rendered USELESS by the iron sand. It's main point wasnt that it was poisoned, it was that it was magnetic. The iron sand can render the joints of that sucker useless like he did with "mom", "dad" and chiyo baa's arm so long as the third kazekage puppet is still functional. and if u think there wouldnt be enough iron sand, just watch the anime and see how big the iron sand cube and pyramid were.
mukade only seems to be effective against close range fights, as all his ranged weapons can be easily dodged or guarded against. even wen naruto's fighting mukade in his ultimate form, he only uses short ranged moves and gets knocked back. sasori's true from has flame throwers that can melt rocks and water jets that slice em. thats firepower. after he figures to mess the ryumyaku chakra up, he would OWN mukade since sasori is a long ranged fighter. sasori's ultimate weakness is his heart thingy, mukade's fighting style is NOT for precision and accuracy, rather destruction and monster-on-a-rampage style. and if ur wondering about sasori's defense, in naruto accel 3 the video game, sasori's iron sand can form a ball around him to withstand even deidara's explosions (sasori and deidara's team ougi, look it up) which im going to assume are on par with mukade's blunt force and firepower.
as if thats not enough, if sasori's puppets WERE to get decimated, hes got 198 more!! and if hes packin that kinda heat, im gonna guess hes got enough chakra to use em all 100 after 100 after 98! by then sasori would figure how to beat him! also, mukade got taken down by 4 ninjas. they ARE talented and strong ninja, but i dont think they compare to a nation. i mean come on..choza, aburame guy, 4th hokage and naruto couldnt possibly beat an entire nation let alone an entire village at the current level naruto was at the time of the movie. sasori took an entire nation with his akahigi technique.
and for those of you who think sasori was "killed", look closer or read again. sakura's and chiyo's exact words after sasori's death were,
sakura: it's over... chiyobaa sama..i knew you could do it
chiyo:no, im the one who should've been killed. sasori saw through my last attack, but for some reason, he didnt try to dodge. HE LEFT HIMSELF OPEN.
(naruto shippuden episode 27).
sooooo thats that and i know it was a long post that i dont even know if anyone will read, but it was sorta just to get it off my chest

and for whoever read, thanks!