
Bose
SoundLink Flex Series
Compact, durable, impressive sound for size, but distorts high volume.

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Harman Kardon Luna and Go+Play, both. And if you can 2 moons better
Two Bluetooth speakers linked into a stereo pair. Which can sound very surprisingly good. Hell, I was at a funeral where they didn't really have a sound system in the old stone church, they stood up a Harman Kardon Go + Play (a single) to play a requested piece of music and it was shockingly capable even in that space.
HK obv goes lower with higher decibels on low frequencies but loudness is almost the same besides the bass.
I only have one which is the Hk go play 2
I compared the sound of the boombox 3 and the HK, and I chose the HK because it sounds more refined. The HK also goes deeper without sounding harsh at maximum volume, unlike the boombox 3.
Harman Kardon Go + Play and don’t look back
I went with the Go Play + for $150
Harmankardon.com. Add it to cart for additional discount
h/k go play +3. $159. End game!
2 Stormbox blasts are 340. It goes below 50hz a bit. If you just want one the go play is the best sounding. The Sonos is also good. As is the essential - but it's $200 and is only stereo in the tweeters, I believe. $350 is really at the limit though. You could get JBL 306's for about the same price, maybe less, but you need and amp.

Bose
SoundLink Flex Series
Compact, durable, impressive sound for size, but distorts high volume.

Minirig
Minirig 4
Tiny, unrivaled sound for DJs, but pricey with bad Bluetooth.

JBL
Charge 6
Portable, durable, punchy bass, but distorts up close, dull vocals.

soundcore
Boom 2 Plus
Budget king for loud, deep bass; bulky with harsh mids.

Anker
Select 4 Go
Great value, good stereo paired, but lacks power for parties.

Ranked #1
Anker - Select 4 Go

Ranked #1
Harman Kardon - Go + Play 3

Ranked #1
LG Electronics - XBOOM Grab

Ranked #1
soundcore - Boom 3i

Ranked #1
JBL - PartyBox 520

Ranked #1
Bose - SoundLink Flex Series