How big are you going? What are you using it for? Are you doing the labor? I am in the process of starting my VersaTube build. Pending my permit request, I'll be DIY'ing their Summit series garage in 22'x26' with 10' walls. So far I'm quoted at $7300. With slab, doors, and electrical hoping to sneak in under $10k but keeping it all DIY and calling in favors.
I heavily weighed the option of stick built vs. metal "erector set", the metal building won out. As far as costs go, for materials you're looking at about the same (unless you start getting over standard residential size garages, 600-700sqft), but the metal building can be up in a few days and that was the differentiator. For me to build the whole thing from scratch would take me 6 months with my schedule, so it was a no brainer.
IMO, stick built is the better option for smaller buildings in a more residential setting since you can match the style to your house, and truly built to suit. Also easier to heat and finish if you want to do that. But if you outsource the labor, you're easily looking at double the cost, if not more. So if you can't build it yourself and/or you need a large building, go metal 100%.
As far as VersaTube goes they've been super helpful with any requests I've had. You can create any building you want on their website, and share that design with their reps to get a detailed quote and spec sheet. In my case, the township doesn't require stamped drawings so that was a huge time/money saver. Once you create a building, their reps can send an extremely detailed spec sheet/renderings instantly via email. Worked great because I wound up changing the size twice after moving the location due to setbacks.
My .02, read and research your local zoning and building codes...over and over again! This has 100% been the driver behind what I am able to do with my building. Depending on your lot size, you might run into major limitations like lot coverage, building style, property/right of way setbacks, height, and square foot restrictions.
The biggest one is building style, some codes prevent you from building anything on your lot that doesn't match your house and/or other houses in your neighborhood. I know a few people that weren't able to go with a metal building because of this, even in rural areas (just in higher density zones with smaller lots).
I started out with the dream of a 24x36 shop with 12' walls, but lot coverage reduced me to 22x26, and zoning code made the walls shorter since accessory structures can't exceed the height of your house in my neighborhood unless they are two stories. Not to mention I had to move the location to a completely different part of my lot to comply with setbacks, since I technically have three front yards. Go as big as your code will allow, unless there are no limits of course.