The difference with vF is it's newer software that has features allowing tune customizations, flashing other vehicles other than your own, different security and permissions model, stuff like that.
OVTune got banned from TacomaWorld as basically a combination of conduct, no intent to obtain vendor status which the TW admins require from people selling items en masse, and the shit storms that would get started on his threads by other users. They got sick of policing it and eventually banned him.
Notable benefits for you would include an adjustment for your tires for more appropriate shift points (which you should have observed when you got tuned on the map for 35's), hopefully more power (depends on the map and this is more applicable if you were currently on stock tune, so you likely won't feel *too much* of a difference from your current tune, but most user edited tunes harness a little additional power...). Should hopefully observe a smoother drive as well, improved shift logic. I say *should* because there's various options out there. The AGM settings would be good for you to keep your battery properly charged. But this is something you do yourself with the vFTuner software or someone does it for you. You don't get this from OVTune.
You don't have a dongle for your legacy OVTune software. The *dongle* was a security encryption device to access your tune software and was black or purple. Your orange device is your tactrix OBD device to connect to your truck.
Because you're a legacy user, you can contact OVTune/VFTuner at their Zendesk and get a link to upgrade to vFTuner for $79. Should come with an OVTune 2.0 tune pack for your ECU version.
As for the custom tunes, these are user-edited tunes and yes, they spread via word of mouth, posts and recommendations on social media, stuff like that.
No one creating user-edited tunes is a professional, but we have certainly learned a lot and made some great options out there.
For example, I created the Coyoza tune for the MT Tacomas and it quickly became the go-to recommended tune for the manuals. It was recently acquired by CVC so that they could own the brand and distribute it themselves without competition. We've since rebranded as YotaWerx Tuning and are now working on 4runner options.
For credibility, well, you're pretty much going off of the honor system and recommendations from others. But it pays to do some homework. For example, if you look at the dyno for KDMax, you can see that indeed do get to advertise that they make more power with their tune than OVTune. However, that power is removed from down low where OVTune put it and redistributed high in the rpm band where it's not needed, meaning that everyone raving about power down low is actually feeling very aggressive throttle response to simulate power. Lol *shrug* it's what it is. But if you do your research and homework on the various options, you'll begin to see the differences and can educate yourself that much better on what they offer and how they go about it.
As for knowing if a tune has professional edits or not, well, you don't really. All of the commonly mentioned tuning options use OVTune as the foundation and were basically developed via road testing and (hopefully) datalogging. I know a couple were thrown on a dyno for some help adding power, but that's what you've got.
@Tyler