Welcome to the Anker community! I hope you like it here.
You are deciding between two great pairs of headphones. I have had the original SoundBuds slim for over a year, and they are awesome. The slim+ is a minor improvement, better low end, and it comes with a neat carrying case to put them into. Now, onto the tag- I got these as a gift for my mom, who loves them. They have slightly improved bass and treble than the Slims (just with my ear). Keep in mind that when the tag clips together, that they will turn off and disconnect from your Bluetooth device. (both have magnets on the back, so you can wear them like a necklace with an 18-month warranty... Anyway, the slim+ won't do that, but it doesn't have an auto turn-off feature.
Actually, instead of either of those, I would recommend the Soundcore Spirit. (https://www.amazon.com/Anker-Soundcore-Bluetooth-SweatGuard-Technology/dp/B07BHHB5RH) Not only does it have Bluetooth 5.0, but it has much better sound, and buttons that you can feel a difference between. Plus, they are more water and sweat resistant. Overall, I would recommend these, because of their overall superior sound quality.
Now, onto the wireless chargers. you probably want the PowerPort Wireless 10. It offers 10W fast charging like you specified, and it is only 17 bucks. Here's a link: https://www.amazon.com/dp/B01KJL4XNY/ref=sr_1_10?camp=217145&creative=399373&creativeASIN=B01KJL4XNY&ie=UTF8&keywords=iPhone%206%20Charger&kwr_id=955&linkCode=as2&qid=1530128448&sr=1-10&tag=ianker-20
If you have a bit more money to play around with (say, 50 dollars or so), I would recommend this pad: https://www.anker.com/products/variant/powerwave-7-5-pad/B2514121 There is also a stand version, which props your phone upright for use while it is wirelessly charging. This pad/stand (the PowerWave 7.5, recommended by @Mark_Dunsmore) has a built in fan, so you really don't need to worry about your phone overheating (R.I.P. Note 7).
In case that was too much to read, here are the links to what I would recommend:
Soundcore Spirit wireless headphones: https://www.amazon.com/Anker-Soundcore-Bluetooth-SweatGuard-Technology/dp/B07BHHB5RH
Powerport Wireless 10 wireless charger: https://www.amazon.com/dp/B01KJL4XNY/ref=sr_1_10?camp=217145&creative=399373&creativeASIN=B01KJL4XNY&ie=UTF8&keywords=iPhone%206%20Charger&kwr_id=955&linkCode=as2&qid=1530128448&sr=1-10&tag=ianker-20
Anyway, good luck on your journey through the Anker community, and I hope you enjoy these products if you decide to get them.