Straight sets
I pretty much never use straight sets
I do increasing weights with decreasing reps.
I'll weigh

D ) in with a different point of view when it comes to increasing weight.
Why would you wait until you have done a bunch of sets before you use your heaviest weight? Warm up, then do the heaviest weight you can on the first set. That is when you are fresh and most able to lift heavy weight.
Straight sets are very useful. They allow better tracking of progress as well as govern the number of sets you do. For example:
Choose a number of reps. We will use 6 here for the example. Put the heaviest weight you think you can lift 6X on the bar and lift it 6X. Keep doing sets until you can't get 6 reps. At that point you are done with that exercise.
This puts you more in tune with your body so that you know when enough is enough. It will also prevent over training since you are more able to keep track of the total load.
If you want to do more sets do a dropoff. Example:
We will use sets of 10 here. Warm up - then work to a 10 rep max for the day. Take that max and subtract 10% - 20%. For 200lbs that would be between 160 and 180 lbs. Choose your weight and DON"T change it. Do sets of 10 until you can no longer get 10 reps. At that point you are done with that exercise.
Using this method makes sure that you lift a max for the number of reps as well as getting in work sets to increase work capacity.
I made huge gains using this and variations of this method for all of my assistance exercises. It keeps you knowing where your body is and lets you work to your peak on each exercise on each day. Some days you will destroy your lifts from the previous week.
Other days you will be less that the previous week. That would be a sign of over training. Since you should be able to either lift more weight for your 10 rep max, or do at least one more set than the previous week. If neither of those things happens, change the exercise or reps. Sometimes it is as simple as your body has adapted to that exercise.
If you are not keeping track you will never know. There is a difference between listening to your body, and knowing where it is at.
You will find that different exercises increase at different rates. You will also see your workouts change as your fitness changes since each exercise will rotate in and out at different times. This way you are not just "changing things to have variety." You are changing exercises based upon the point where your body adapts and tells you to change.