ASIC miners are easy to use, very stable, but You have some limitations (risks). Mostly they are designed for one ALGO, and You can use ti only for coins which use that algo.
Also, the ASIC miner market is specific. Only a few producers which exploit huge demand for ASICs and have a very specific model of sale (Bitmain reservations, orders, delivery plans...warranty issues).
Also, they overproduce some models (D3). On the beginning it was the most profitable miner at all. But now after tens of thousands produced (difficulty rise to the moon, price do not follow it)...so, You can mine 8USD/day, now. Very loooong ROI. Check the EBAY, You will find hundreds of offers in half of original price.
Probably, We will see the same story with L3...difficulty almost doubled in last 3 days
/2jnrd3y]http://[Suspicious link removed]/2jnrd3yIn GPU mining You need to have some technical knowledge, and You can always have some issues, because You use ordinary computer parts, most of them are not projected for 24/7/365 work.
In other hand You have a much wider choice of coins and ALGOs. You found a better profitability, only start another software, and go... Also, it is easier to find the components...
So, If You have a good deal for some new developed ASIC what You get in few days, take it...if You need to wait delivery for months...You never know how profitability look like...