A 15 is preferred by many over the 201 because it has a vertical bobbin assembly, which many like better for FMQing. Really, it would depend on what machine you come across that is in the best condition, with the most attachments, for the best price, IMO. The 99 and 128 have very small throats. I wouldn't want to quilt on those for very long. My 128 is probably my least favorite machine of the herd.