Not everyone. I could never get a sound I loved out of any Mark series, certainly not the IV. It was hard work even to get ones I really liked on R1 and Lead, and I could never get on with R2 at all. It either works for you or it doesn't! On the other hand since I can get dozens of sounds I love out of a Rectifier and a lot of people can't, if you're having trouble getting on with your Rectifier I would suggest trying a Mark series
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I'm sure there are people who can get what they want out of both, too... but not me. The two series are about as completely different as it's possible to be for amps made by the same company. If you know how to read schematics, take a look at the two and see just *how* utterly different they are - almost nothing in common whatever aside from that they both use multiple cascaded tube stages.
The two really big differences are the placement of the EQ and the presence (or not) of cathode-follower stages. Marks have pre-distortion EQ and no cathode-followers; Rectifiers have post-distortion EQ and a cathode-follower-driven tone stack (apart from the clean channel on the 3-channels and the Single/Rectoverb, but I don't really like those either!). It took me years to realise why, but these are the reasons I generally like amps that come from the Tweed/Marshall lineage and not from the BF/Boogie one.