@RCLumens, interesting paring.
The two lights have very different characteristics, so it's interested that you're considering choosing between the two, being a flashoholic I didn't, got 'em both. Here's a photo of these two side by side.
The Mi7 is small and light for an AA light, whereas the Titan Plus although small actually weighs more than most (all?) AAA lights. The smaller Titan Plus loaded with Eneloop AAA (57g) actually weighs more than the Mi7 (Al version) loaded with a 14450 cell (48g). Brightness wise, the Mi7 will also actually go lower and higher in brightness and throw better than the Titan Plus. There are also differences when it comes to UI.
The Mi7 side-clicky has been known to accidentally activate in pocket. Fortunately, the light can be both mechanically (via loosening head) and/or electronically (via long press&hold) locked-out. The Mi7 offers single click to High, and direct access via long-press to Low (both good). The oddity is that users must cycle through Medium (if On High) before turning Off light. Also, being an electronic switch there is the matter of parasitic drain from the circuitry.
The Titan Plus on the other hand is a classic twisty, On/Off via Tighten/Loosen. Progression is from Low to Medium to High, via twists within 2-secs. Simple and robust. And of course it comes with the Surefire warranty, which is important if you plan heavy duty usage.
Other minor differences include, tail stand ability versus keychain ability. Variety of body colors and body material (Al or It), versus the gorgeous nickel-plated brass.
FWIW, I haven't EDC'd either. My current pocket rotation includes an Olight S-mini or Olight iT3.