As a reason user myself, I can say that the methods to sequence are different to FL, which from what people tell me, is mostly mouse orientated, with right click serving to delete any midi data you don't want.
Due to its ideal mouse oriented sequencing method, FL is probably the better choice, but Reason has its own methods for quick sequencing, but to take advantage of this, you have to learn keyboard shortcuts which might seem annoying at first. Once you've got them tho it becomes second nature.
When in the EDIT window, you can toggle from the mouse to the draw tool using Command (on mac). I'm not sure of the command for this on windows but I'd assume its the ctrl key.
Thats the only command I use alot however, and I get around fairly quick.
For deleting single notes at a time, I'm afraid you guys are going to just have to get used to that delete or backspace button, if you click your mouse (left click for windows) on midi data while holding down backspace, you'll delete that note. I prefer the click and drag method, which if you do while holding down the backspace or delete key, will delete the data for you when you let go of the mouse.
As for quick switching of tools, the Q,W,E,R,T and Y keys are all shortcuts to change them as well, Q is the mouse tool, W is the draw tool, E is the rubber tool (which also deletes various notes) etc.
In other words, you need to learn a few commands on your keyboard to get around reasons sequencer efficiently, but once you do, I doubt its any quicker than FL.