If your goal is to move towards more shortboard style moves I'd go with the 606. If you're looking to have a smaller and more manageable board than the longboards but still want that cruisey glide then I'd steer you towards the 610.
Based on your difficulty making the decision I'm thinking you're leaning more towards the 606? It's going to have plenty of volume still for your weight but it'll have you well on your way towards shortboarding where the 610 might still feel a bit long (although compared to what you've been riding I guess both are going to feel really short)


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