I only use MTDE harnesses now - they're very comfortable and the design/shape when worn seems almost perfect. I use the lightweight Club for tight or pushing trips, or where it must be stuffed into a small bag for part of the trip. I use the heavier but supremely comfortable Picos for bolting or long SRT trips where I'll be hanging around for a while - the bum strap makes a huge difference to comfort, but is heavier, and it will definitely not fit in a small bag, no matter how hard I try, even with everything separated. I also use a Garma chest harness - more expensive, but again, super-comfortable, has loads of loops for hanging kit, and is properly PPE - as in, you can hang from it if you have to, unlike regular chest straps. It's not as cheap solution, but allows a lot more flexibility. And that also won't fit in the small bag, even with a Club in, so I just keep that on. A cheap backstrap with some snap-buckles to connect the chest harness to the sit harness makes it even more comfy.
If you're only getting one, I think you'd be very happy with the Varonia.