As to question number 2, it depends on your application. On a benchrest, the 2 stage trigger is going to be a better option in something like an SSA-E or DMR trigger with a clean break on the second stage and 2 lbs or less depending on the trigger. At 3 lbs, the SSP is not going to be as good. In this case, you have time to advance from the first stage and feel the wall of the second stage before you need to pull the trigger. The lighter weight of the second stage will help in accuracy. Now compare that with something like 3 gun or even hunting where you are limited on time and your blood is flowing. In this case, the SSP might be a better option. With a 3lb break, you can get your finger on the trigger with just a little bit of pressure while you are getting your sight picture. As soon as it all comes in alignment, break the single stage and you have a good shot. With the two stage trigger, you have one more action that need to be taken. You are in a time crunch, but you still have to get through the first stage and hit the wall on the second stage without accidentally breaking the second stage before you mean to and misfiring. It can be difficult to control some fine motor skills in these types of situations and that is why removing the 2 stages and going to a single stage might be better. Of course, this is just my opinion and other people might have different experiences.