[SOLVED] Which Is better? 32GB of 3200Mhz or 16GB of 4000Mhz. Please share your opinion

[NEWBIE)]

I found a website that was selling memory for pretty cheap. I'm stuck between these 2 options 32GB of 3200Mhz or 16GB of 4000Mhz. I don't exactly know what Mhz does to performance. It's pretty cheap for me to afford. So please share your suggestions on which would be better.
The motherboard I'd be pairing it would be MSI x570 Tomahawk Wifi

Please check the link below, I couldn't attach an image for some reason.

The price difference between these 2 are really really low and I want to go for the best.

16GB 4000Mhz
32GB 3200Mhz

 

[hotaru.hino]

For AMD systems, it's not a good idea to go above DDR4-3600, maybe 3733 because the Infinity Fabric speed (basically the processor's backbone) is tied to the memory's clock speed. It caps out at around those speeds. If you go any higher, then RAM is serviced every other clock cycle, increasing latency and negating any performance gains

 

[sizzling]

It also depends what you are doing. If you need more than 16gb then go with 32gb slower RAM as it will be faster. If you don’t need more than 16gb for your usage then having 32gb won’t help at all. Extra RAM only benefits you if you are actually going to use it.