The re-badged 25 W MX250 offers almost no performance benefits over the 25 W MX150. If jumping from the 10 W MX150 to the 25 W MX250 or 25 W MX150, however, then expect a performance boost of about 30 percent. Save your wallet and get essentially the same GPU performance from an older MX150 laptop instead of a newer MX250 laptop.
https://www.notebookcheck.net/After-reviewing-four-different-GeForce-MX250-laptops-just-go-with-the-cheaper-MX150-instead.420137.0.html