Beginner Wanting To Progress,

So I'm looking to progress from a soft board to a hard(Ish) board, I have done 10 2 hour surf lessons and I am pretty confident now with paddling out and I have managed to catch a few green waves and I am now looking to improve my skill level but I was just wondering if I should stay on a soft board or try and challenge myself with a hard board, if you guys or girls can give me your thoughts on this subject that would be great.