I usually use commas as option separators, etc. But when pixel width is limited, sometimes the extra 3 or 4 characters comes in handy for things like Blue/Red/Black/White instead of Blue, Red, Black, White.
The specific example I had in mind in the OP (Awesome Product - OptionA/OptionB/OptionC available), I was actually thinking of a category page I'm working on and not a product (I realise now my choice of example title was confusing).
Originally, category structure was this:
Awesome Product
-
OptionA
-
Lots of products
-
OptionB
-
Lots of products
-
OptionC
-
Lots of products
-
etc
But subcategories have been noticeably slipping over the past year, and I've attributed this down to the landing pages cannibalising each other. So I'm in the process of flattening the whole category and using filters to separate the different product options, and working on strengthening the main category page to accommodate all user search patterns. While drafting a new title for the category page to incorporate the deleted subcategories, I was just curious how Google treats the forward slashes as I'm usually a comma person too. And whether it makes a difference at all to Google.
**TL;DR: **I'll probably stick with the commas because it does look more readable for users, just wondering how Google reads characters like that and whether it extracts the separate keywords OptionA/OptionB/OptionC.