Which one would you choose? 

Unbiased opinion after using both, PV every day. But that's just me. SEPST has it's fans too.

The interface, user friendliness, touch screen and integration of the target tune from Dynojet is what does it for me.

It depends what your end purpose is though, are you having your guy tune it on dyno? are you just going to load a "close enough" calibration and call it a day? Are you a tinkerer at heart.....

I like the idea of the touch screen on the power vision. At the moment the bike has V&H big radius 2-2 and SE heavy breather and when that was installed it was "tuned" at the dealer which I assume would have just been a can map but was done by previous owner. The only other mods performance wise that may happen will be a set of cams so that's why I'm looking into tuners now. 

I have the PV1 & very happy with its capabilities, the ability to adjust the speedo calibration was a winner for me amongst a few other little goodies available for it, the Wide Band O2 is a great addition for those who like to play on there own :) 

As has already been suggested if you ever intend on putting the bike on a dyno contact the tuner & ask what he prefers to work with

How well does the "autotune" feature work with the stock o2 sensors? With the PV do you need to use a laptop at all or can you do everything direct from the touch screen? 

Definitely leaning more towards the PV. I like the fact that you don't need extra cables to link it to a laptop for any adjustments, you can just do it all from the unit itself. Live gauge readings would be a nice bonus too

Sorry yeah, I realise I will need to connect it to a computer to load load a new map onto the unit, but I won't need to have it hooked to a computer to do everything like the SEPST

I know the auto tune feature with the standard o2 sensors will never get the tune 100% but I think it will still be an improvement over standard canned maps? 

Yeah I see the SEPST has the smart tune feature as well. As far as actual tuning capabilities go it seems that both units are capable of doing pretty much the exact same things. 

Paul on another post re fuel economy you mentioned you couldn't get close to my fuel economy cruising on a highway even when my cruise was at a higher speed. I was thinking the biggest variable was probably our tunes. Does power vision standard auto tune run it a bit rich by chance? My tune was a custom dyno tune (using SE tuner but they all change the same ecu tables obviously)

Autotune basic gives about 13 to 13.2 to 1 AFR right up until 80kpa then starts to wander a bit

take not that this is AFTER the learned values are exported and flashed to the bike.

When the tuner is performing Autotuning, it is leaner, but timing is retarded 4 deg. So hurting the engine isn't really a concern.

Rule of thumb I've used is just add 5-10% more fuel in that part of the map and you got yourself a pretty good runner. You can get some weird VE spikes too but with enough "re-runs" of the AT can smooth that out pretty well. What the AT doesn't account for is some of the bonkers timing tables Dynojet give you from the library. Some of them I shake my head at, some are pretty good but I like to start cautiously and wind the wick up incrementally saving a new tune each increment. Run it for a bit logging the ride, then exporting into the good old log viewer software and seeing how It went. It's a long process but something I kind of enjoy doing.

I'm lucky to have access to a dyno pretty much whenever I want and have the Target tune module, but for your average "stage 1" I think AT basic is fine, get a good starting map from Fuel Moto and you will be amazed how good you can get one to run with a bit of time.

When you have bigger cubes, cams or a combo that is a bit out of the ordinary the target tune is brilliant, just can be a pain in the ass to wire into some bikes like sporties where the widebands can foul the bike and hiding all the modules under the already cramped seat area.

SERT is great when on the dyno and have all the cables connected running live, but as a DIY tuner it's not the most user friendly IMO.