last time after our manager sent our rewards on signature campaign it took a day to confirm the transaction the longest transaction I've ever had. So I came to think of it if Bitcoin can have a fast transaction like Ripple (XRP).
Why are you complaining for 1 day? DO you know how long international wire transfers take? WEEKS.
Signature campaigns pay minuscule amounts, do you wan't him to spend half of the payment in transaction fees? OF COURSE i would use the lowest fee (1 Sat/B), this usually takes about ONE HOUR, and rarely several hours.
Yes, in theory campaign managers could use Lightning Network, given that the payments are frequent and often, it makes a perfect use of it. Unfortunately, Lightning Network wallets are still rare. Perhaps when the likes of Electrum finally add it, but even LN has had changes lately so i still don't know when this would ever get critical mass use (if ever).
You mention ripple but that is the case of everybody else, due to lack of use among other things. Except perhaps ethereum, because their blockchain is used for a gazillion things not eth (all those tokens and smart contracts, etc). Go ahead and send 1 dogecoin while paying the lowest fee and see how long it takes, its probably faster than ripple...
Bitcoin transactions are perfect for most uses. I always use the lowest fee, i even bought something once online that way, and got it faster than ever compared to using the traditional wire transfer fiat method, that usually takes at least 1 day for the seller to confirm, while with bitcoin 1 hour later he got it confirmed AND, no stupid bank working times (which in this country suck).