Ok you see how your plants from last grow perfectly naturally in a way hat maximizes light exposure. It's built into the plants. With that setup (aka not training) you get slightly less yield but perfect buds from bottom to top. When you train you fuck with their growth structure and you end up shading some lower buds. Most people get around this by harvesting only the topmost ripe buds as to clear room for sun to hit the bottom buds and let them develop more...i would imagine you would still get some fluffy buds...
Point: it's a trade off either way, it's really up to you...training is fun and gives you something to do but is not necessary to get kills buds.
oh and do not top those girls until you have at least 4-5 nodes....I waited 8 weeks from sprouting the soil