You sound personally invested and seem to be ostensibly asking questions but following them witch commentary anyway demonstrating that the questions were disingenuous. Are you an Apple shareholder or something?
You come across as if you are trying to make me out as someone who doesn't think their purchases through properly and that of course on the contrary, you do your research before purchasing.
So what is the best way to judge any product?
1) Search for the official specifications of the product and make a judgement whether or not the product would possibly fill a need or fulfil a personal desire. If it seems it does, continue to research more so as not to regret your decision later.
Once determined the product might be suitable, search for OBJECTIVE and TRUSTED online reviews of the product, make sure that the product reviewers are as unbiassed as possible, preferably not having received sponsored or "review samples" of either this product or past products. Compare it to the product you own to balance out the pros and cons and consider whether or not the product actually improves enough to purchase.
If enough of the data points emerge positive, make the purchase.
OR
2) Search for the specifications of the product and make a judgement whether or not the product would possibly fill a need or fulfil a personal desire. If it seems it does, purchase one with a four week money back unconditional offer AND ACTUALLY USE THE DAMN THING and see if it is what you want and need for the price. Watch a few reviews by people who currently have the phone to see if you might have overlooked something blatent during the last week or two of use.
Now you can decide to keep or return the device after HAVING ACTUALLY USED IT. 100% money back, free return postage, as is the law here in Japan.
Personally, I would choose a week of using the phone over anyone trying to sell one to me without me ever having carried it around in my pocket and bag, running all my necessary applications, playing some games, watching movies, taking photos and listening to music.
Try before you buy is my motto. Always has been, always will be... In over 30 years of being an consumer, I have never once paid for something I later regretted. TBH, anyone who spends money without doing that is basically gambling IMO.