I have had great success with the Silver Tip resin and hardener.
I recently tried some RAKA to save a few $ and found it holds bubbles if one mixes too vigorously. The bottom line is, when the RAKA is gone I will switch back to the Silver Tip ,as I believe that the extra $ is money well spent.
And - yes - I have used West System but I prefer the Silver Tip.

John VB