IMO Union is much better at these levels. I'll be headed out there sometime around 4ish.
Since you'll be at Confluence to get the boat, you might as well take a look at the park and decide for yourself. Union at these flows has a couple of nicely retentive drops (#1 & #3) that you can surf and spin on all day. Drop #2, aka Hollywood, is fast, steep and super fun. Go vertical (or inverted) if you like, but be ready for a fast transition. #4 is is like surfing an non-breaking ocean wave. Front surf, carve back and forth, but do anything else and you're off the wave. I haven't seen anything beyond #4 that's worth hiking back up from. Have fun!
"A witty saying proves nothing."
- Voltaire (1694-1778)