Both companies delivered excellent results in their most recent earnings reports. But Google massively increased CapEx while Microsoft's CapEx ended up being slightly below expectations, reflecting their differing AI strategies. MSFT has obviously been on a losing streak that now seems to be reversing, while Google's price trend is less clear. There's also a general anti-Microsoft sentiment among consumers (e.g. "Microslop"), whereas Google isn't as widely hated (yet). Although stock prices don't tend to care very much what your average consumer thinks of the company so this part probably doesn't matter much.
If you didn't own either stock but had to choose between buying only one of them today, which would you pick and why?