I don't have experience of both, but I've been around the block for a while, and done a fair but of research on them. The Armley Schulze is in a class of its own, the romantic era masterpiece of one of its most creative English organ builders, but in a sense still a German organ adapted to Englishness. Many of the stops haven't been built for other organs, let alone available for Hauptwerk. Schulze himself said he'd never again make another echo flue oboe. At the same time it is a residence organ, but made for a very large residence! The acoustics at Armley are a bit interesting, because the transepts are so long and narrow. So you have to get used to it, you can't register it like any other organ that's ever been made. Still, it rewards those who get to know it with some great sounds you can't get elsewhere. So quirky, steeper learning curve, but amazing.
The Romsey Abbey is a pretty straightforward English Romantic organ made by a reputable English Romantic organbuilder, but that has been continually added to and modernized over the years, so leaning a fair bit more toward modernity. The specification isn't the same as the actual organ, it's been extended by duplicating ranks and so on. You can play just the original specification, but then you may miss some things you may have been accustomed to on an English Romantic organ. It's not a bad organ, but it'a not a masterpiece. Its acoustic is not bad, but also not great. The recording is very modern, but personally I prefer the warmth of older style recordings like the Armley. It's hard to trust Ricchard McVeigh's sound, because it appears he tinkers with it a lot, so if you think you're leaning toward this one, get a trial version and thoroughly listen to it on your setup. So modern, not quirky, less learning curve, but more vanilla. Many have said it's not a typical English cathedral organ, and I agree. It's a Neo Romantic organ with a modern flair, so you have to adjust your registrations for that a bit, and it doesn't have the smooth as butter blending or mystique of the great organs by Hills and Willis. But I'm sure it's perfectly serviceable, and if you're a Richard McVeigh fan, it might be cool to have the same organ as him! It has annoyed me to no end that he has steadfastly refused to post the specification on his site in any readable form, but if you sort of want to know what stops it has, you can pause the video at various points and squint very hard to try to make them out. I suppose you can also just go to the national pipe organ register site (but I am still annoyed!), and that doesn't show how they've extended the stoplist.