As always, the answer is “it depends” !
- Cave de Ribeauvillé - I’ve never visited, but have had the odd wine. Solid coop, won’t be anything spectacular, will be the cheapest.
- Louis Sipp - very well made wines from a good range of terroirs and a couple of Grands Crus, from which they always have a range of vintages, which is a rare opportunity for a vertical tasting.
- Hugel - high quality, and right in the centre of the impossibly picturesque Riquewihr. They literally wrote the rules on late harvest wines. Will be the most expensive. You are most likely to be able to buy their wines in the UK, which could be seen as positive or negative - if you like a wine you’ll be able to obtain it here, vs the chance to taste something that’s only available on the spot.
- Burn - unique wines, especially from the Clos St Imer which is entirely theirs. The Clos St Imer pinot gris is astonishing, and they are arguably the best value of the four in terms of price/quality.
Something else to consider is the geography of the four. The first three are all very close, while Burn is around a 30 minute drive away - but assuming you’re flying out on the Sunday night, it’s in the right direction. It would be worth making an appointment, as you wouldn’t want to drive down there and find that they happen not to have someone there on that day.
It’s also worth considering language - I don’t know whether you or any of your party speak French. Cave de Ribeauvillé are likely to have someone who speaks English; Martine and Etienne Sipp both do, but they don’t always serve so it would be a good idea to make an appointment (probably worth doing anyway, actually); Hugel will always have someone who does; at Burn they speak some English, but French is definitely better if possible.
Not definitive for you, but hopefully more information with which to make a decision!