So I've been doing some digging and I think the UCJV330 model is using the Epson i3200 heads, hence the new ink delivery system and the 4pl droplet size, and moving away from the Ricoh Gen5 heads that are in the 300 version. If I had lots of volume I'd probably go for the 330 model but I think I'll be more than happy with the 300 model, gotta make a decision by tomorrow on it. It's a shame they didn't do a configuration that is C, M, Y, K, CL, CL, W, W that probably could've added some speed to the 300 model.
Do you know what the ink droplet size of the Roland is by chance? I can't seem to find any info on it.