l've had so many 5150s over the years. My order, of the ones I've owned, would be this.
The ones I've really liked.
5153 100S (this is my all time favorite amp. The red channel has this weight to it that I love. I have 2 of these.)
5150 212 combo (the most unique and awesome of the Peaveys)
5153 100 6l6 (not too far off from the 100S in some ways, but less aggressive and less gain)
5153 50 6l6 (low end on the regular 50 watt just hits so much more similarly to the 100 watters than the 50s amps. I also have 2 of these because they sound great and are a convenient size and weight.)
5152 (Had one of these on and off for about 10 years. Just a great, tight metal tone without a boost needed)
5153 LBX-S (Awesome little practice amp. I gave this to my 12 yr old son and he loves it)
From here down, I start to like them less.
5153 50s (messier response than the original 50)
5153 EL34 combo (Didn't spend much time with this one, but still sounded like you would expect)
6505+ 112 combo (Similar to the 5152, but sounds much smaller)
5150 BL (Never gelled with the low end response on these. Absolutely brutal sounding, though)
6505MH (reminded me a lot of the BL I had, just smaller in size and tone)
5150 Iconic (This one is weird. I had a great experience with a 40 watt combo, but it wasn't what I remembered when I bought one. Didn't like the heads at all)
I haven't played the 5153 EL34 50 head or 100 watt head. I don't generally go for EL34 amps. I also haven't played the 5153 6l6 combo, though I'm sure it's similar to the 50 watt head.
I also owned and played all of these through different cabs over the years. Used Eminence Legends for a long time, and more recently with a Mesa OS cab with 2004 V30s. Vader cabs, custom cabs, Earcandy with green machines, KSR, celestion Redbacks, Peavey cabs with Sheffields. So kinda hard to nail some of this down because of that. Just what I remember of all the ones that I can pull out of my head. I may be forgetting versions. Many of these I've owned more than once lol.
I currently own 2 5153 100S and 2 5153 50 6l6 heads. The 100S is just my perfect in my head tone. Feels addictive to play. The 50 watters are around for convenience because the 100 watters are absolute massive haha. I keep the 50 watters at my practice spaces.
I always look at others amps, and they never stick around for more than a year or 2. Always end up back with a 5150. Guess it's a good problem to have lol.