If that crypto for payment methode the best choice is XLM and DASH, because has small fee transaction and faster transaction than BTC. Developer of DASH is very active to promote advantages of DASH and continue in development, i have seen DASH use for buy good and service in merchants and will be many company interesting to use it. XLM has good fundamental too because has partnership with IBM.
actually that alt said would be good but also i have some alts to add with, if user's would preferable for trading in a term of condition by market demand we'll then I admire for ethereum as it is the second of bitcoin and also first alt that highly demand by lot of investors as it has the most potentil to gain value soon like bitcoin.