Boom 2

Boom 2 at Costco for $99. Absolutely love mine, loud, clear sound and killer bass. 5 stars.

Very happy with the UE Boom 2 for 10 years but replaced by the Bose SoundLink Flex 2 which delivers very pleasant sound (if you lower the bass a notch with the 3-band equalizer) and a small Xiaomi Sound Pocket 5w for less than €20, very satisfactory for my electric scooter 🛴

I find it hard to say bad things about one or the other. I've always liked the neutrality, spaciousness and lack of distortion of the UE Boom 2. The Bose SoundLink Flex is characterized by a very rich sound, including the bass (which in my opinion should be lowered a notch in the equalizer as already mentioned in a previous comment). Still, listening to Pink Floyd's "The Wall" on it for example is pure joy, even at high volume...It almost feels like you have hi-fi speakers in the room, it's very impressive compared to the size of the speaker. Its main fault is its very weak autonomy, we end up using it almost always plugged in but what a sound! Very pleasant (but the EU was far from unpleasant but only more neutral, therefore less flattering) That's basically my opinion 🤗

I can't comment on the Hyperboom as I've never heard one. However, I have heard various generations of the Boom and Megaboom and I can tell you that these definitely don't sound good at all.

All three speakers are excellent choices in their respective size categories and offer great value for money. Now you just need to consider what size speaker is still practical for you to use. I would say that the UBOOM X is where you start to get a full sound. In terms of audio quality, I would even put it in first place. The ONN Large Party speaker is of course a little more powerful in terms of sound, and Boom 2 is the lightest and most convenient to transport of the three.

If you're strictly limited to Bluetooth I'd recommend the JBL Xtreme 3 or even the Boom 2  If you don't mind a plug in, the Sonos era 100 is a great option 

The X600 sound clarity is great but if we're looking at something similar with better bass the JBL Xtreme 3 and Sony Ult Field 5 are much better Just on Bass the Boom 2 also outperforms this 

The UE boom 2 isn’t as difficult to carry as you’ve opined. Used it for over a decade, went everywhere with me including the beach since it is quite versatile and rugged in build quality. I’d not recommend getting a smaller one as the sound quality usually gets worse.

Just bought a Boom v2 at Costco and was so impressed. Great little speaker for the money. I’ve got a Marshall Emberton and the Anker smokes it.

I have a UE Boom from 2015 that I still use multiple times a month as well. It does not seem like something that would last a decade. Super cool.