Depends what you using it for and if you want a tube or a solid if you want a solid get the modi 2 uber which is a upgraded version of modi 2 but I think you need to fit it yourself. So you will probably need someone who has experience with taking amps apart.
FYI the Magni is an amp, Vali is an amp, and Modi is a DAC.
So amps can be designed for many different attributes, but tube amps generally are known for having a less edgy, fatiguing presentation than solid-state amps, and they also tend to enhance the sensation of soundstage a little bit. Both are very good gaming qualities. The midrange is also generally perceived as a bit thicker and more present. The Vali in particular doesn't have amazing soundstage properties but the Vali is the warmer/less hard option from Schiit while the Magni is a little more dry sounding and a bit more bite, both are pretty close to eachother and pretty neutral, and Schiit is hardly the only amping option.
I personally went with a DIY tube amp (which I had someone else do for me), ymmv.