Do you have a tank to house a full grown silver/black aro? If that is no problem I would go for the silver. Never got to own a black aro, but I have owned several silvers. Aside from my oscar, I have never owned any fish as friendly as those silvers. If you care about looks you should probably get a black aro though since most silvers will develop drop eye. Also consider getting a Jardini or leichardti, both are similar to asian aros and look very stunning. The only problem with getting a Jardini is they generally will attempt to kill all your fish if your tank and tankmates are not big enough.