I play both and prefer the Yamaha. I like the tone, and also the evenness of tone throughout the whole keyboard. The Suzuki has a few notes which resonate too much and stick out. I find the Yamaha to have a warmer sound than the Suzuki.
I think you’ll find that everyone describes them very differently. In reality they’re not really that different from each other! Players make their own sound. Different microphones also create very different results.
I wouldn’t agree that one sounds happy and the other darker or funkier. Its how you play it! But the Suzuki is to my ears a little clearer.
I vote for the Yamaha
Maybe just get the one that looks nicer to you? You’ll get the other one sooner or later anyway 🙂