I think it depends on your purposes. For floating firing pin self-loaders like the Garand, the primer seating tool built into the Forster Co-ax press is best, IMHO, as it guarantees the primer is well-below flush with the head of the case, which is important for discouraging slamfires. For high precision rifle loads, getting primers to ignite with consistent timing and flame strength and duration at consistent firing pin energy requires seating them so the anvil is compressed 0.003" into the priming mix. The only tool I am aware of that lets you measure this directly is the K&M Primer Gauge Tool. For handgun loads and plinking loads, you can generally use any tool you like the feel of.