The Mini is considerably lighter if you can get by with 4 or 5 pedals instead of 8 or 9. I prefer the option of installing the PP2+ power supply under the PT Jr, but the Fuel Tank Jr fits in the top slot against the kick shield on the original Mini. Tough call. Stage depth seems more of an issue around here than a couple of inches of width, so I think the Mini might win overall. I wish Voodoo Labs would make a good 5-port PS the size of the FT Jr, since I think the Voodoo product is quieter than the TRex.
As far as your footprint onstage the Jr will feel much bigger than the Mini. Think of your body and the way you stand, then consider a pedalboard in front of you, deeper is going to add much more to your footprint than wider.
That said I have a Jr and it's great for me. If I only had enough pedals for a Mini I'd probably just go without a board altogether (or get one of those bedroom boards). I love the Pedaltrain idea, but the Mini doesn't make a lot of sense to me.
In my band, in addition to playing guitar, I also sing, so I'm somewhat compelled to keep a simpler board with only one row of pedals. I love my PT Mini, as I can fit four pedals and a power supply and it's easy to access all of them. I'm in NYC, so I pretty much have to walk or subway it to gigs with a guitar and my pedalboard. So having a Mini makes my rig that much simpler and lighter.
I am setting up a mini and have way too many pedal choices. I think the answer is to get a mini, and then a second nano, or mini and have a flexible setup with different pedal flexibility and size for different jams. Obviously the two can be placed together, and powered by 2 one spots or trex jr. Granted-IMOP. The best answer is to slim down your pedals to few or none.
I also have both. I use the mini when I know I'm only going to need tuner>boost>tremolo. But, if we are playing a venue where I may need some more funk tones like my phaser and envelope filter, along with some delay, I move things over to my Jr. I really like the mini for its simplicity, but mine is modded to have a TRex Fuel Tank Jr. underneath. If I didn't have that, it would see very little use.
Mini it is. I have a crowded PT2 now and will convert to a slightly larger Vertex board/system/rig next year. So this will be my grab and go board: Mystery drive > Kingsley Page > Kingsley Minstrel > T1M mini volume > DMMTT550 > Wet. (I measured). Polytune Mini in the well. Fine for jams and small things. Probably most things lol.
Question is, how to power it? I'm not sure what the deal is in getting an ISO-5 under it.
This is kind of interesting, I just went through a similar exercise for a "smaller" board versus my fully loaded PT1. But my project was to go with only one of my amps and work with the amp's footswitch. I ended up designing a six pedal board plus tuner set up and I'm going to put it all on flat 18 x 12 board with a small riser on the back row. I was going to go with a mini and place the amp switch on the floor in front of the mini, but it didn't work out. Plus I want to be able to just pick it all up when packing and setting up... not putting down my mini and then placing this here and that there, just a nice little 3 to 5 minute set up time!
Something like this, but slightly different, slightly smaller and a bit more narrow...
This is exactly what I did. Asked myself which ones I really had to have to get by comfortably. I ended up with 3 pedals and a lot of extra cash after I sold the rest of them... They're on a homemade board the size of an A4 page. Powered by an 8 AA battery pack, so no power supply worries either.