BTX w. 85mm is 30X magnification
BTX w. 95mm is 35X magnification
I don't think 5X is going to make a huge difference in reading mirage/wind.
I think glass quality/clarity/resolution is much more important for reading mirage and wind. The ability to focus at varying distances helps give you a more accurate reading of what wind is doing from shooter to target. Because wind is anything but constant in any type of terrain change.
Also, being able to determine wind DIRECTION is important. Then determining what you are seeing as far as deflection will help you decide on wind SPEED. But you have to see these changes in real time. Panning to find where mirage appears to be blowing either directly at or away from you (mirage not blowing left or right) will help determine the direction along the shot line. Once you find where mirage appears to be straight up, you will know by feel (either on your face or back) which way it is blowing at the shooter, and you can determine from there the clock direction.
Remember too, there are varying wind values at clock positions (these are the easy versions to remember).
12:00 or 6:00 still effect bullet impact (high or low), but not drift (not including spin drift).
12:30, 5:30, 6:30, and 11:30 are a 25% value of wind speed.
1:00, 5:00, 7:00, and 11:00 are a 50% value of wind speed
1:30, 4:30, 7:30, and 10:30 are a 75% value of wind speed
2:00, 4:00, 8:00, 10:00 are a 90% value of wind speed
2:30-3:30 and 8:30-9:30 are a full value wind
Getting good at reading wind takes practice, and actually shooting in the wind. If you have buddies you shoot with that have the right equipment and experience, it helps flatten the learning curve greatly. They can help explain what they are seeing, and why they are making the wind calls they do. This is a typical shooting session with a couple of my shooting buddies. Lots of $ in glass, amd this isn't even close to all of it.