I prefer micrometer seating dies so I can read the changes I make. The performance is similar with most, some are harder to read than others. I use Whidden and Forster, they both work great, but prefer the Forster. I wouldn't bother with an arbor press unless your loading for Benchrest or similar. FL sizing dies control should bump, base sizing, runout and neck tension. Those are far more important than seating depth. Don't get me wrong, seating depth is still very important, but proper sizing is critical. Ironically the best finish I ever had at a national match was at an ELR match. I loaded that ammo with the cheapest dies Redding makes. Measuring tools/gauges are also critical.