No preference for cut: I’ve seen awesome-looking Roman and Gothic chasubles. Never seen conical in use, AFAIR.
Where my preference comes in is the design/embroidery. I would much rather see dignified designs around the traditional cruciform concept, even if simple (more elaborate ones reserved for higher celebrations). I have a much lower preference for the typical bread/cup/wheat embroideries that adorn more modern chasubles. Least preferred of all are plain/blank chasubles, and we still see in some places white chasubles only with the coloured stole worn over it. That last one is a liturgical violation and has to go.