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Modius Magnius will be clean and transparent at risk of being clinical, sterile, harsh. It will have Unison USB.
Jot 2 is considered to be a more engaging listen, has more power, and offers more varied sound signatures between the balanced and singled ended outputs. It will not have Unison USB.
I prefer separates based on my comparisons. For a similar budget you can get a Jot 2 plus Modius or Modi Multibit or Modi 3+ – depending on your needs for balanced, Unison USB, and preference for Multibit vs delta sigma.
I’d offer up the Modi Multibit plus Vali 2+ as an option, with Amperex/BEL 6922 or Electro Harmonix 6CG7 tube.
@MokhaMark is in the process of comparing the Modi Multibit and Modi 3+, so perhaps stay tuned for his impressions.
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I’d prob opt for focusing your budget on the Jot 2 no module and stick with your Modi Multibit, especially if you don’t need Unison USB.
Good luck.