For hard product, there's not much to say beyond the narcissism of small differences that is the stock in trade of most bloggers.

For soft product, I would have put A3 close to the top about 18-24 months ago, but I've noticed a marked reduction in standards since then (worse meal choices, no Illy espresso, much worse desserts).

People love to hate on LO but as long as you avoid the Dash and your flight is a reasonable length (ie more than 10 minutes at cruising altitude!) I don't think their J product is noticeably worse than others, and in some ways better. If you like to drink, then LO FA's in J are more willing to pour alcohol down your throat than anyone else. I remember one trip (MUC-WAW) when I asked tentatively if they had any cognac and the FA immediately bought me 3 mini-bottles of VSOP and then pointed to the nearby drinks trolley and told me to take whatever I wanted if that wasn't enough! I could literally have grabbed a hatful of bottles to stuff into my bag if I'd felt like it.

J loads on LO tend to be much lighter than LH and others so you can often be the only pax or have just one other companion. As the FA/pax ratio is generally much better than on the likes of LH, you basically get instant service.

On TP, if the crew is short-handed (happens often due to labour disputes), J service can be cancelled and you might not get anything more than a glass of water.

On SK flights (SAS Plus is their PE/Pseudo-J mishmash), I sometimes pick up a disapproving vibe from the matronly FA if I order more than one G&T on a 2.5h flight ("You want another?")

I'd put OS above LX and their mileage credits for premium cabins to other *A are much better than LX (let's not even mention LH, which is zero more often than not).