MultiRoblox vs Bloxstrap
Bloxstrap multi instance is a toggle inside a full bootstrapper. MultiRoblox or Bloxstrap can both break after a Player update. If you only want extra windows, MultiRoblox vs Bloxstrap is a narrow tool versus a full bootstrapper.
What each product is
Bloxstrap replaces how Roblox launches. It can carry themes, FastFlags, and other options. Multi-instance has been added, removed, or broken across versions. MultiRoblox does not try to be a bootstrapper. It tries to let extra desktop Player windows start.
When to stay on Bloxstrap
If you already use Bloxstrap every day and extra windows still work after the latest Roblox update, keep it. Stacking MultiRoblox on top is a good way to create a support nightmare.
When MultiRoblox is enough
If you searched for multiple Roblox instances and do not want FastFlags, use the narrower helper. Keep Microsoft Store Roblox plus desktop Player as a two-window fallback. Neither product is made by Roblox.