Star is without doubt faster, but I wouldn't go as far as saying the bullets from a Star lubesizer are remarkably better than those from a RCBS or Lyman lubesizer. For someone who is just casting a couple thousand rifle bullets per year for his own use the Star is a bit over the top cost-wise IMO, but everyone spends their own money and makes their own decisions. I have one on order but i cast 10-20,000 boolits per month.
If you want to shoot the "best" possible bullet you probably shouldn't size at all. Shoot as-cast, and pan or tumble lube. The less sizing you do, the better in most cases. Bullets from a good mould are as concentric as they are going to get - sizing them will at best only preserve the existing degree of concentricity, and in most cases concentricity is lessened through sizing.