Another perfectly fine alternative.
It would be hard for me to pick between the GLC and X3, as I owned and adored an X3 for 5 years, but I think the new interior design would kill it for me, even if ultimate build was better than the Mercedes. Oh there are also some absolutely infuriating ergonomic/UI issues on the new BMWs as well.
Having driven both the last X3 and X3LCI extensively and the new GLC, I would think both new generations would be perfectly adapted for their everyday purposes. One just feels like a BMW and the other a Benz. Who needs an Audi that is trying to be everything and now looks like the product of a thoroughly extensive design clinic process, that is trying to please everyone, but seems to excite no one.