This is the UK Amazon link for the Sony SRS-XB402M in black. I recommend it if you want the exact model I tested, mainly for the solid build, IP67 outdoor reassurance, and that really nice stereo separation. Just keep an eye on pricing because I felt it was a bit pricey at around £249 when I recorded.
Pros
+Really good soundstage with strong left/right separation
+IP67 dust and waterproof rating (and Sony says rust-proof)
+Compact, portable design with distinctive RGB lighting
+Extra Bass and Live modes plus a 5-band EQ in the app
Cons
-Bass drops off as volume increases; not ideal for bass heads
-Audio/video sync is noticeably off (especially on iPhone)
-No 3.5mm aux input and no USB-C
-Cannot sync/pair with other speakers; one device at a time