I've been using Wizard Labs since they have the nic, pg, vg and a whole bunch of flavors. I'm not super picky on taste, IMO but the boysenberry was super perfumey, I thought.
Ethyl Malto is the only sweetener I have used so far and I like it fine. I am really new at DIY but I am quite happy with some of my DIY attempts and will continue to delve into the wonderful world of DIY

Personally, I have like the 4 tobacco flavors I have tried once I started using the ethyl malto and some caramel in the mix with a touch of tobacco absolute. I have used Marlboro, English, Virginia Fire cured and Asian Ry4.
I generally make 5 ml batches but with the tobaccos, since I liked them, I just made 4 different tobaccos in 15 ml so that I could start experimenting with these "base" flavors and add other ingredients. I tend to like tobacco flavors in general.
I have been making fruit flavors using 10% fruit [50/50 on strawberry/apple, my own mix] and 5% ethyl maltoand have made boysenberry [yuck], strawberries and cream [that is a TFA flavor and not a mix of my own], cantaloupe, apple, kiwi strawberry [TFA flavor not my own mix]
I find them to be quite vapable and like being able to try them alone so that I kind of know what they taste like before giving mixing them in with other types like tobacco, graham cracker, whatever my culinary mind can come up with.
I have been using ethyl malto liquid.
I am very new to DIY but have found it to be very satisfying. I have spent about $100 but have enough product for 12 - 30 ml bottles or $150 plus dollars worth of e
juice. Some of these items will be in use for quite some time. Many of the flavors will last me for quite a few DIY sessions and all the blue glass bottles will last indefinitely. Some of the large gauge needles, the syringes and the pipettes and such will be usable for quite a few batches. So, my costs are going down fast.
Considering how much I vape, I think it is money well spent. Oh, and I can mix up 24mg, 18mg or 12 mg as I feel I need it instead of having a bunch of different flavors and strengths bought well in advance since running out of juice sucks.
It's kind of fun and more convenient.