The new UV editor and UV toolkit in Maya was inspired by a cool third-party plugin and this is obvious. It just looks so fresh. Packed with features, carefully organized, tidy, nice submenus, proper spacing, etc. To start with, the 3-side layout UI in Max- top, left, bottom- for buttons needs to be simplified by removing the bottom one and instead using that part only to display info. Not least, the nice iconography in Maya toolkit completes all of these, with ideal size for icons and just enough padding around them. This kind of UI could be used for Edit Poly command panel UI as well when bringing the remaining unique tools from the ribbon here in a unified place.
Maya UV Editor and UV Toolkit

3ds Max UV Editor and Unwrap UVW Modifier

Maya UV Editor Menu Bar and Context (Marking) Menus

