Yes SRP is classed as more of a polish than Black Hole, however because SRP is so filler heavy, I don't think they are miles apart in terms of performance.
If you already have Rainforest Rub, then I would probably change my mind and say go with Dodo Lime Prime, and then just 2 coats of Rainforest Rub (very good choice in wax, my favourite along with Purple Haze)