What is a good TD that does have good R/W speeds and where does one look for the specks.
The short answers are "none" and "nowhere".
Thumb drives are tiny and cheap and you tend to get less for those tradeoffs and write speed is usually the most likely victim of that economy.
With respect to specifications (specs), the numbers you read on the package are nearly useless to the point where the SD Card manufacturers had to come up with a new rating system just for consumers to be able to trust them. You'll see an SD Card that says "100MB/s read and write!" and then down below it will list a speed rating of U1 which means "we only really guarantee 10MB/s for writing, but who knows - if you have a laboratory and ideal conditions then you might get something close to the other number we listed in a much larger font".
The real answer is to look for independent reviews that test a lot of the flash products and indicate which give better speeds despite what is written on the package. For example, here is such an article from "the wirecutter" which is a NYT company for tech reviews:
The Best USB 3.0 Flash Drive
There is only one thumb drive that got above 1/2 on write vs read speed, one other that was just under 50%, and most were around 10-15%.
Please note that the #1 drive they recommended specifically stating that it was "the fastest" wasn't the fastest at writing in the chart you find if you scroll down a few pages. It was the fastest at reading, but it was second fastest at writing, beaten by the SanDisk Extreme Go product that wasn't as fast at reading, but was better at writing. So, make sure when you read the recommendations list that they are recommending the product specifically for the reason you are looking and check the various charts to see how the product you are looking at fares on the specific numbers that you care about...