Very different games so it makes comparing them difficult and often unreasonable. Counterstrike is more skill based due to the general layouts of the map being static and consistent for the players, while Rainbow 6 Seige is more on gameplay strategies with scouting sites, making kill-holes, and using gadgets to gain an advantage over an opponent. Plus tickrate is better in cs:go and higher ping does not give an advantage, unlike in rainbow six 
Never played cs-go so I'd have to go with rainbow six siege. I've watched a few videos on cs-go and it seems I'd get bored of it.
SWAT game
cs:go is cheaper
cs go
Rainbow six siege!
What edition is the Rainbow Six Siege reward?
Nah I still prefeer CS:GO
Bzgvubsxugxd vsu zhs a
counter strike
R6 for sure
csgo
in 3 steps
Choose the game that interests you and play itfor free.
Every game has some quests for which you will receive Soul Gems.
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
You know that on Gamehag you can get real rewards for free, right? Join us, complete walkthrough and get your chest!
In this moment i prefer Rainbow six