I’m quite pleased with how this transition looks, changing from red to white. 
For the last stitch of red, instead of a single crochet, I did a slip stitch and then slip stitched into the next one as well and fastened off. 
Then, with the white, I went back to the last stitch and slip stitched into it; then I put a single crochet in the next stitch, (the second slip stitch of the red.)
My thinking was that 2 slip-stitches equal a single crochet, with each colour dividing the stitch in two. 
I know that there re many methods out there but I think I will continue with this one as it makes sense in my head and looks pretty good, in my opinion. 
What is your preferred way? I can be swayed!! 
- Debbie