Yesterday's Crochet Granny Square And Spiderman Afghan Update

I made this granny square yesterday.  I have the leaflet, somewhere, but don't recall the name of it.  I weaved in the ends this morning.  This makes 5 squares, and I don't know if I will make more.  I am just cruising here, waiting for the pain to go away, and doing some rounds on the Spiderman afghan, basically mindless crochet, while I watch Pygmalion (1938, by George Bernard Shaw).  If you've seen My Fair Lady, this is the 1938 movie.  I really enjoy seeing the difference between both movies, how the Audrey Hepbourn movie was set at the turn-of-the-century 1900's vs this movie, which looks almost contemporary.

There is a crocheter who is looking for a good way to join his granny squares.  I wonder how THIS afghan will be joined.  There is:

1. slip stitching on the right side
2. slip stitching on the wrong side (hides the joining)
3. single crochet joining on the right side- makes a sort of frame around each square
4. whip stitch, back loops only- makes for an almost invisible joining
5. whip stitch both loops- shows the joining and can be part of the color scheme
6. Priscilla Hewitt's braid joining (link to come) which is nice and lacey
7. join-as-you-go joining- you join with a single crochet or slip stitch at the end of each round of granny square
8. there's another method, which I don't remember but hope to add later

Do tell me which one you prefer and why.  Thanks a bunch!

River

P.S.  Here's the Spiderman Afghan so far: