I am invested in Monaco / Tokencard and will probably buy some Tenx as well on their new card models but I can't say with absolute certainty which has the better project team as I haven't really seen them in action yet. Despite Tenx having a working product they have been around a little while but haven't exactly set the world on fire and then rebranded their card. They have all had recent ICO'S and need time to show their metal.
I think you mean
mettle.
http://www.dictionary.com/browse/mettle