i like ladino clover or improved white clovers (Alice). they can grow well in medium pH (mid to high 5s). Alsike tolerates wetter conditions but only lasts a few years. red clover will grow "anywhere" but again has limited life span. it is cheaper than the ladinos, as well. if i had no soil info and wanted something to try i would go with red clover and mix in a bit of ladino and see if it works. (knowing that it very well may not)