It's been said to get the most out of grappling training it is wise to train in both gi and no-gi. That said, do you have a preference?
I've been doing more no-gi stuff lately, and there are som interesting differences I've come across. One thing I've found is that what works in no-gi works in a gi too, but the reverse isn't true!
"Let your food be your medicine, and your medicine be your food"