You should be able to delete recordings from either unit.
I’ve never used my Express outdoors, but I didn’t have any trouble reading the similar display on my Clip. Then again, I instinctively shade things so I can read them better outdoors.
I can delete recordings from my C240, but only using the computer, there’s not an option in the player’s menu options to delete them wiyhout connecting to a PC. Wondering if I would be able to delete recordings without connecting to a PC.
If you like to delete recordings and be able to see outdoor, Clip is a much better device. As for Sansa Express, you cannot delete recording on the device, you have to use the PC.