This one looks in a bit better condition from what I'm reading from the photos, probably MS-64. However, the 81CC is more valuable than the 84CC.... in 64GSA this one is listed at $415. I really don't know how accurate NGC guides are on GSA coins, but they actually list them lower than just straight coins. That seems weird to me. Either way, its the same question... if you want to sell now and maximize value, getting it stickered is your play. If you are going to hold it long term, no need.
This one makes the least sense financially to slab since raw to MS 63 does not have as big of a spread as with some other dates. However, if you are sending the others in, it might still be worth it to include this one as an MS 64 grade would still leave you a bit ahead (even after grading costs).