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Depends on what size tyres you run. The i29's, being wider, can offer a better tyre profile for trail riding (wider tyre footprint thanks to the wider rim, more tread in the ground, better traction; greater volume, can run slightly lower pressures again for better tyre deformation to the ground & grip, etc). But such gains on a 29mm internal width rim like the i29 are best seen with tyres in the 2.35"-2.5" range usually. Extra benefit of the STp is that they're symmetrical spoke bed. The asymmetrical versions offer more balanced spoke tensions but the offset spoke bed has less material on one side and is more prone to denting. Lots of the MTB asymmetrical rims share this problem.
The EN323 is a very good rim, better made than the i29 arguably and will be lighter, but has a 23mm internal width so tyres in the size mentioned above will tend to have less support on the side walls, squirm more under hard cornering load, burp, etc.
But if you're running 2.1"-2.2" tyres then the EN323 will be fine.
t_w-
That's really helpful, thanks a lot.
Despite the fact I am running 2.35" I doubt I could feel the difference due a lack of riding skills.
So, I will send i29 back to Wiggle then and upgrade for something fancier later on.
Or maybe someone happy to grab these for £28? I took the last two from Wiggle.
Also, I am going to try set up EN323 tubeless - it looks doable with the right amount of tape.
Cloak/Dagger
How good / bad Mavic EN323 rims are? Is it worth to replace them with WTB STp i29 which I've got for cheap from Wiggle?