Not so fast.
It is true, that if you do not do meter comparison carefully, readings will be wildly different if not done on same sample from clean area at same time. It takes some trickery. Yes once settled on meter - use it and drop all others.
I have been concistently able to compare and evaluate meters - yes no fun and a pain, but it was necessary.
All other comments aside. These meters DO NOT ACT the same on all bodies regardless and I was driven nuts till I found those meters that ON MY BODY could give reliable consistent results and do not trip up over the "total" sugar reading versus the glucose D readings the body runs on.
Hemocrit and water ranges as well as oxygen operating ranges of a meter affect how it will perform on some types of bodies. All meters here are NOT the same.
I have had meters whereby I would eat some of the trick sugars and send my readings reliably up 40 to 100 points no sweat and last 6 hours till crap rubbed out of system.
As for going low - falling BG and going high - rising BG - yes who cares on rising if it is 40 to 100 points off.
On falling BG and bg at 100 and a reading to 40 to 100 points offset is a real big deal.
Not said much today or related is the 13 folks who died due to the use of PQQ test strips used in hand held equipment in a hospital reading trick sugars causing horrendous insulin injections.