I just compared Fleetwood Mac Rumours on audiophile vinyl (Pallas pressing) versus SACD. I used an EMM SACD player and ARC Reference level preamplification. The SACD had better and clearer highs (guitar fills mostly). The vinyl had a denser and more satisfying vocals and mids. Ultimately it was a draw.
sorry to break it you, but the Pallus 45 rpm pressing of Rumours sucks. i have 2 copies of it. the bass is fat and lacks articulation, and the sound is congested and life less. my guess is the 45 is digitally sourced. not surprised the SACD is better, as i recall i also prefer the CD.
i love Rumours, one of my favorite recordings. so 10 years ago i went on a mission to find an original pressing; which after buying 10 early pressings i finally found an original, and it’s awesome. most of the early pressings are ’decent’. they did sell like 25 million copies of Rumours in the 70’s so there are lots of them out there. i also have a 15ips 1/4" early generation RTR master dub of Rumours which is even better than the original pressing.
typically a 45rpm reissue of a vintage rock album is on the same level but a little different than a good original pressing. but in this case the 45 is not very good at all. it is still great music, and the 45rpm format and vinyl gear will bring some positives, but it’s way down the list of best ways to hear this.