There is a lot going on between these two bikes and I had a hard time thinking about how the maverick would be different than the mayor back when I was buying a new frame.
First off, if you haven’t already, really look at the wheel base. That is going to have a big impact on how a bike rides. The maverick is a huge bike. For example, the wheel base is in the same range as a Trek Slash or Santa Cruz Nomad. So even if you use the stock fork at only 120mm travel, the maverick is going to ride bigger than the mayor, not that there is anything wrong with that.
Next, look at the bottom of the geo chart for the maverick. It says “geometry without suspension sag”, while the mayor geo chart shows measurements at 20% sag with a 100mm standard fork. So that complicates things some.
But, before we go into that though, it is important to think about the mastodon EXT vs the Standard. You may already know this, but if not, the EXT has a 20mm longer a2c than the Standard for the same travel. So, if you plan to run a 120mm EXT, that is the same height fork as pretty much any standard 140mm fork. So, in essence, the EXT is a 140mm fork, but with only 120mm of travel.
I believe maverick has another geo chart showing geometry with a 505mm or so a2c fork height to show geometry for a Standard 120mm fork at sag or the EXT with 100mm travel. This shows the maverick at 68/75. However, the mayor with the 120mm Standard fork or 100mm EXT would be more like 66/73. I found this to be a very important distinction between the bikes for me.
Now, when I was looking into the maverick, one think I was thinking about was running an angle adjust headset to get that 2 degrees back. But it is more complicated than just adding an adjust headset though as the fork needs to get longer to keep the height the same, so then I was looking into having to get the EXT fork and then it was getting too complicated so the V5 mayor it was for me.
ETT on the maverick medium looks to be quite a bit longer than the large mayor also, so will have more room and feel a little longer when seated. The head tube is quite a bit taller on the medium maverick vs the large mayor as well, which contributes to its taller stack and longer wheel base.
Sure there are a few more other things, but I think that‘s most of what I was looking at when I last bought.