I personally love the design of Beosound 1 and 2, I think they're two of the most iconic and timeless pieces of the B&O collection.
However, rationally, if I had now to choose between Beosound 1 and Level (or A5), I'd
definitely choose Level/A5.
Currently, the ASE platform BS1 runs on is still fairly well supported, however it runs on extremely weak hardware.
If you have any interest in using Chromecast specifically, absolutely don't buy BS1. ASE products have been updated at the beginning of 2022 to Cast firmware 1.52, and that's likely the last version of Case they'll see. Then, in 2-3 years, Google will raise the minimum Cast firmware version needed for most Chromecast features, and you'll find yourself no longer able to use Chromecast (just like it happened with many devices B&O has left with Cast firmware 1.28 confirming they'll no longer be updated to more recent versions, hence basically ending their Cast functionality).
In addition to that, Mozart as others have mentioned make the Level (and A5) much more serviceable, so in case you'll have issues in the future (out of warranty) it should be easier and cheaper to find parts to get them fixed.
Mozart devices, in addition to the sources that older ASE devices support (including BS1), now also supports Tidal Connect.
Again, in terms of look I am
ALL for the Beosound 1, and I'm sure I'd enjoy listening to it and staring at it with these eyes -> ????
But I am quite sure in a few years, it will become a pain to actually use (
unless you use it just as a Beolink endpoint, extending to it sources that are originally played by other, more recent, devices).
TL;DR: unless I'd find BS1 at an incredible price (i.e. 50% the price of a Level in the same condition), then despite the love for its design I'd definitely go for Level/A5 (A5 likely being even cheaper brand-new).
This is my point of view, from a purely technical/platform perspective (not sound).