I could never chose just one as my favorite they are all my babies
My main categories are caudiciforms, aloes, jades, haworthia truncatas,and mesembs.
My favorites in each category are aloes (Aloe ramosissima X dichotoma, Aloe polyphylla), caudiciforms (Pachypodium brevicaule), jades (Crassula arborescens undulatifolia), haworthia truncatas (haworthia truncata lime green) and mesembs (Titanopsis)