I have a USB-C umik-1 and it's great for measuring room acoustics, where the frequency sweeps etc can be played at a loud level. I am sure it's more than adequate in that regard.
That being said, for the price difference it could be worth paying more for the lower noise floor of the umik-2. I also use my measurement mics for assessment of low level background noise, and found the noise floor of the umik-1 to be a limiting factor. I have never tried the umik-2, but minidsp seems to have nailed the space for economical measurement mics that perform well.
I ended up using a uPrecisionMic from Studio Six Digital, which is a lot more expensive but has a very low noise floor and a ruler flat frequency response with good omnidirectionality. It's also a USB mic with built-in pre-amp & ADC (like the umiks). With this mic, very low level sounds can be recorded and played back with negligible noise. The umik-1 is much noisier in this kind of application. I'm not suggesting you get a uPrecisionMic, but it's an example of a use case where the umik-1 might be limiting.
The Studio Six Digital measurement mics (they have a couple) also have analog output jacks, which can be convenient for running audio i/o from a smartphone etc (but for value, and if you don't need this, the umik-1 can't be beat). If you'll only be doing room frequency sweeps, and budget is an issue, the umik-1 is great. As is noted above, the smaller umik-1 capsule gives better omnidirectionality than umik-2.
Sorry for going on about the Studio Six Digital stuff - I have no affiliation, but like their hardware and software. It's way overkill for room measurements. I have this stuff and still use the umik-1 for room measurements.