Which is the Better Tonearm - Pro-Ject or Rega?

agreed.

To answer the OP's question, the Rega arm is better than the Pro-Ject arm.

The Rega arms are hard to beat for the money.

If I may, can you expand upon why the Rega arm is better than the pro ject arm?  I'm doing a bit of browsing and research on both for a new TT and curious about this topic as well.

You didn't ask, but I can tell you what makes the Audiomods arm so good (especially for the price). Jeff installs internal arm tube stiffeners to get rid of the resonance peaks of the tube of the best Rega arm, also drilling small holes in it in a carefully arranged pattern, also to remove resonances, replaces the steel ball bearings with ceramic ones for lower noise and friction, machines a new one-piece yoke and bearing housing, adjusting the bearings for far lower play than even the best Rega, installs a damped counterweight of his own design, rewires the arm with either Cardas copper or pure silver wire, machines a new height-adjusting turntable mount, with an optional micrometer offered for ultra-fine on-the-fly VTA/SRA adjustment. And there are others! More details on the Audiomods website. The best buy in pickup arms.

I have one and it is great.Makes wonderful music with my denon103r