It can make a HUGE difference if you adjust your chain on the center stand as apposed to the side stand, especially if the rear ride height of the bike has been raised! Be careful!
If the rear ride height has been raised, the swing arm will be slopped much more to the rear when on the center stand and the rear wheel will be almost touching, if not actually touching the ground. If you adjust the chain to the recommended tension in this position, it will be WAY too tight when the bike is off the stand and you are sitting on it! So tight that you will be putting tremendous torque on the drive shaft bearings and the rear suspension won't be able to articulate because the swingarm won't be able to travel upwards beyond its' horizontal plane!
With the bike on the side stand, there is some load on the wheel and the swingarm will be more horizontal. Adjusting the chain in this position will be a LOT more accurate but it may still be too tight once you sit on the bike if the rear ride height is raised a lot.
My rear ride height is raised and I adjust my chain on the center stand, BUT, I adjust it so that it is lightly slapping the swingarm where the adjustment sticker is affixed. It appears way too loose on the center stand, but once back on the ground with me sitting on it, the chain is tighter and within specifications.
I always check the chain after I've adjusted it with me sitting on the bike. I carefully reach down and test the tension at the sticker. If there's no slack, I get off and loosen it some more. If it slaps the swingarm, I've loosened it too much. It's pretty easy to judge that the chain has the proper slack with a one finger test from on the bike.
Once you have the chain adjusted correctly for when you're sat on the bike, it's a good idea to put it back on the center stand and then measure how much slack the chain has while on the stand. That way, next time, you know how much to adjust the chain while on the stand.
Remember, it's much better to have a slightly loose chain than a tight one. A tight chain puts a heck of a lot of strain on the drive shaft bearing and can cause it to fail over time!