Both are really Good points but I don't entirely agree A) true as a lead it can be easier to lead with it, but for 1 thing the right hand is straighter and faster to make up for that a little. In turn I feel because of the distance/time you have with a right hand it is easier to throw counter rights than counter hooks. You can also hide the right hand behind your shoulder so an opponent either doesn't see you leading or countering with it B) You can hide a right hand too as mentioned and better technique sees it not being telegraphed C/D) Both can be pretty lethal
fact is its not that black and white. It depends on the fighters, how they move, which style they use etc.
I completely agree with what you are saying in essence. A straight, sharp right hand lead is a great tool. For that matter, so is a sharp right hand. SO many don't throw it down the pipe shockingly. I'm seriously looking at highlight package after highlight package of great fighters, and they put serious loop in their right hands. Big thing to remember to about the right hand, in my opinion its biggest advantage, is that when it is properly thrown it is the longest power punch in the orthodox fighters arsenal that doesn't sacrifice balance.
Left hook for reasons already stated. Shortest distance is the main reason. A fighter who is good at hooking hard off the jab (like Sonny Liston) is especially dangerous. After fielding a left jab a fighter's natural instinct is to look for the concomitant right cross from his opponent, so when that jab is suddenly followed up by a short, quick left hook to the temple it can have devastating effects.