Use both.

Go to a fabric store and buy a yard of nylon or poly strapping for 2 or 3 dollars, buy the widest you can find usually 2 in, and some fusing tape. Fusing tape is an iron on glue.

Then go to a hardware store and get 4, 2 in D rings, Ace Hardware here locally carries them. Fold the strapping over the rings and iron the tape to the end, then iron the ends to the strop. Fusing tape is very strong and will last many years.

Paste both strops, Diamond is more aggressive and can be used when a bit more keenness is needed.

Chrome Oxide will smooth a harsh edge and can revive a flagging edge. but not as quickly as Diamond. Many use Chrome Oxide after Diamond.

They are both good to have in your tool box and use as needed. Make sure to wipe your blade well before putting it to leather after using either pasted strop.

I prefer the SRP Chrome Ox crayon over the spray, it is much less messy, but have both and both work well. You need very little of each, 4-5 sprits.

Good Linen while used mostly for cleaning the blade, can also do the same thing with many more laps (2-300 laps). The potential for linen and leather is often over looked.

Make sure to always keep your spine on the strop.