Dear @luis223344 : The quality performance for play mono recordings quality performance between a stereo and a mono cartridge is not " night and day " differences and if you have two tonearms then makes more sense to me that you buy two different stereo cartridges, this is a limitless decision because the mono cartridge puts immediatly a limitation of playing alternatives in those tonearms.
As @jasonbourne52 pointed out the Umami Red is an excellent quality performer. The Dynavector top of the line is excellent too as the Colibri or the LPS.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.
https://www.audiogon.com/listings/lis981a7-benz-micro-lp-s-cartridges