Yes, they are still worth buying, but IMO are most worth it when the pricing is less than the current models - especially considering you can find i5/8/128 13-inch models for under $1,000 new if you shop around a bit, that pricing makes it worth it, and for those needing a lot of storage they now have 256/512/1024 GB SSD upgrade options.
Only you can assess if one design meets your needs better than the other - personally, I like both designs, although neither are perfect.
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I really really wanted a rMB but couldn't get past paying that much of a premium for the power it offered, even at the cost of being fanless. Find it interesting that Huawei was able to get a U-series chip in their laptop without a fan.
The rMB has a surprising amount of power - it does not perform anything like any other m3-based device I have used, and I was left floored by how much the 2017 model improved over the previous two years. How Apple was able to get the rMB to run so fast with such long battery life, to dissipate heat so rapidly, and to resist thermal throttling so well without a fan, I will never know, but they did an incredible job refining the 2017 models - the only thing lacking is the removal of the headphone jack in exchange for a second USB port, and USB 3.1 gen 2 (the rMB is still legacy USB.)
One huge advantage the rMB has over both the MBP and MBA is that its base SSD is 256 GB - which is far more practical than the base 128. As I am sure you have seen, the biggest savings on Apple sales are usually with base models. With the MBP and MBA, that means accepting a comically small SSD. With the rMB, that means getting something far better. I got my 2017 rMB for something like $1,050 - for what I paid, and considering the quality I got (I'd go as far to say it has the most consistent finish of any Apple product I have owned), I am very happy with the value.
Every Huawei product I have seen thus far has impressed me.