ime5000
Yes, this "debate" has been going on since both mods became available. However, I do not think there is any "debate" at all. They are BOTH quality high tech devices and both companies offer good customer support.
Everything in vaping is subjective. you like this juice and I prefer that one. One person prefers attys another cartos, etc.
Bottom line is that both of these vape well, they just do different things in different ways. As to what makes "pro(s)" vs "con(s)" is a matter of personal preference. There are ProVari fanboi(s)/goil(s) and there are Darwin fanboi(s)/goil(s). Each device has "features" and those features are just different. Which is "better" is a matter of personal preference. Clearly, by my sig line, I have a preference. I have had both devices and posted my "first impressions" of both devices (both very positive).
Both have had their share of issues and returns, and both companies stand behind their products. The warranties are different too. People can argue which had "more" issues but the only people who really know are the owners of each company. The more important question, on THIS subject, is "are the users/customers happy with their customer service?" and it seems most are happy with the customer service from both companies. ALL new high tech devices go thru some of this. The first iPhone had thousands of returns. The first Android phones had many problems too. Even several generations into an Android device like HTC's 4.3" phones (now out in 4 different versions) still has many returns - look up HTC Thunderbolt. But, the question remains - are the customers happy? There are iphone fans and Android fans - neither are "wrong" and neither product is "better" but one device may be "better" for one person and the other may be for someone else.
Some people prefer a tube shape and swappable batts, others prefer the thinner shape of Darwin. Some prefer having the size adjustability of ProVari (18650 & 18490 batts) and others prefer the longer life of a single charge and PT features of Darwin.
Some prefer digitally stable fixed volts (variable set thru menus) and others prefer the watts settings of Darwin.
When people say this one or that one is "better" they are stating their opinion based on their personal preferences of these various factors.
There is an extensive Provari thread here:
http://www.e-cigarette-forum.com/forum/provape/131028-provari-variable-voltage-mod.html
There is an extensive Darwin thread here:
http://www.e-cigarette-forum.com/forum/nhaler/151096-darwin-evolv.html
I'd encourage you to make a list of questions you may have about each device and post those questions in the respective threads. I would discourage you from asking in either thread "which is better" because that is the "debate" mentioned several times already in this thread.
If you are starting from scratch (need everything - incl batts and chargers), they come pretty close in price. many argue this point but if you buy Provari, the extension cap for larger batt, 2 batts, charger and the warranty extension (so they are both 2 yrs), the price becomes relatively comparable.
On the warranty side, the edge goes to Darwin because That warranty is transferable and last I checked, ProVari warranty was not transferrable. Darwin warranties batt for a full year and then charges $25 after the first year for a replacement (comes with a new full yr warranty). As far as I know, batts are not warrantied on ProVari. But, Darwin has to be sent in for batt replacement and not for ProVari. Darwin's batt is not proprietary an and "can" be changed by users who know how to solder the contacts but opening Darwin voids the warranty.
While this post may not address the question "which is better" I think a more realistic question might be "which is better for YOU?" and only you can answer THAT for yourself. I think both are quality devices that each take vaping in new directions. Each operates differently and each has different features. As I said, each feature - and the combinations of features that each device offers - is a matter of personal preference. Vapors can get defensive and/or adamant about their preferred and anyone saying one is definitively "better" is only really saying which is "better" for "them".
Hope this is somehow helpful to you.