I don't think micro sd will ever catch up to full size sd in storage space, and the pricing is very much on the side of full size sd, 200gb micro sd is $240, and 256g fullsize is $80. There are already 512gb full size sd for $450. There is a 512gb micro sd on the horizon, will have a rrp of 1k! It is likely a 1tb full size sd is on the way given how rapidly manufacturers are shrinking nand memory die size, we should see the price of 512gb full size sd drop. summary, full size sd will always be ahead in both capacity and value, and probably by about a two fold margin for both.
Your clip+ has a 4000 song limit, that's about 200gb of flac, so you could theoretically rock a 200gb micro sd in your clip+, but that would be the absolute limit for you due to song capacity.
The PAW has a 16,000 file limit, and full size sd are available in 512gb which you could rock in the Paw. So no, your clip+ is not at all on the level of the Paw capacity wise, especially when 1tb full size sd come around which the Paw could utilize due to 16,000 song limit.