Not sure who you are asking specifically, but I'll answer.
Quincy 5 HP Compressors - Air Compressors Direct (quick Google, I bought mine locally). Shows the "5hp" & real 5hp options.
The cheap QT-54 is comparable to what you'll find in any big box store. The 5hp is rather exaggerated. It (and the big box models for that matter) will do a fine job for weekend warriors, which really includes me.
The next one up is the 251CP80VCB. I'm struggling to remember if there were any amp draw differences between that one & the one I got (not actually listed on that page). I think the only difference between them was the magnetic starter. It's kind of dubious as to whether or not you need a mag starter at 5hp, but it's more durable. I also wanted to wire up a Zwave light switch & they are 110v only. Easily done safely with a magnetic starter (and my compressor now shuts off when I turn off the shop lights if I forget). You get a lot more CFM and at a higher PSI with the real 5hp units. I do a bit of sandblasting, which takes a lot of air, so that's why I went bigger more than anything. My old fake 5hp units were ok, but not great. I had to wait for recovery time a bit.
All things considered a bigger tank will help with moisture. Air can cool longer before going out the lines & cool air is dryer air. You still need an inline dryer... unless you live in Colorado like I do (no moisture in any of my coalescing filters or desicant tank).