My PC has a lot of MP3 fiels and videos. Sometimes I would like to listen to my stuff while ssomewhere else in the huse. I don't have a bluetooth headset. Not yet.

I would rather have a portable speaker. 

So whill looking at reviews on the Google mini, I see a ad that SAYS the Amazon Echo is more popular. Why?

Rather than sort through the ADS, I am asking you PEOPLE for an honest anser.
Shoul I go with the Amazon device or the Google thing?
Or many neither one?

Thanks in advance. 
Food for Thought...Both of those are "home assistant" type devices, their PRIMARY function isn't really to be used as a speaker.  They can both play music from streaming services like Spotify however neither support playback of MP3s stored locally on a PC.  If you want to play your MP3 collection without paying for a subscription streaming service and don't need the home assistant functionality you'd probably be better off loading the music onto a smartphone and then getting a simple bluetooth speaker to use with it.Thank you both.
Now I have sometnhing to think about.
After giving it some thought, I might just wait awhile.
Or just use the bluetooth speaker I already have.
But it does not take commands.  Cause yer askin them to do something they don't///you need to decide.Well, what I would like is an inteligent device that would understand tha t I do not want to ever hear nay more Marty Robins songs.
Do they have something like that? A personal DJ in a can?
I don't have any Apple devices other than my old iPhone.

iOS 11: How to Use Siri’s “Personal DJ” Feature

I doubt taht would work, I have an iPhone 4.