What sefer (prob Mikraos Gedolos) has the most meforshim in it?
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I'm not sure if Torah Shleimah becuase it's more of an encyclopedia that doesn't separate the commentaries.
Otherwise, look at SeforimCenter's Mikraot Gedolot category and compare for yourself -- there are different sets with different focuses. For example, there's Mikraot Gedolot HaBahir which includes Zohar Nigleh, there's a mikraot gedolot of commentaries by the Abir Yaakov, there's a mikraot gedolot of Chassidic masters, etc.
Not a physical book, but the Bar Ilan Responsa program has dozens of commentaries.