When choosing a Bluetooth speaker, what it really comes down to is size and price. If you're looking for a very portable speaker, you'll want to get something very compact, but remember that smaller speakers usually produce less sound and bass than larger ones. So while there are plenty of mini Bluetooth speakers that deliver bigger sound than you might expect, they do have their sonic limitations. For a lot of people it's a question of finding a speaker that's not too big or too small -- one that travels well but also is capable of producing good sound for its size. But finding the best portable Bluetooth speaker also comes down to your budget. Price can be a limiting factor. You may not want to spend $150 or more for a small speaker. Luckily, there are plenty of good options for $100, and some decent mini Bluetooth speakers can cost less than $50. Also, certain "value" brands that sell primarily on Amazon are strongly worth considering because they do offer a lot for the money. If you're looking for the best sound quality, as I said, bigger is usually better, and some larger portable Bluetooth speakers -- sometimes referred to as Bluetooth boom boxes -- can put out a lot of sound and have an integrated handle for toting them around.