What country are you in? The device selection does vary, although both of the two that you mentioned are available in multiple regions.
You’ve gotten a lot of excellent advice on US brands. I did want to quickly mention a couple of notes on the two that you originally mentioned, which are available in multiple regions.
THE AEOTEC MULTISENSOR
Which model Aeotec sensor were you looking at? Their multi sensor is rated for outdoor use, but specifically not for motion, because it will have too many false alerts.
From the manufacturer:
Outdoor sensor .
Use outdoor intelligence. When installed in a waterproof & anti-condensation enclosure, you can use MultiSensor 6’s non-motion sensors outdoors.
This is a common issue with most PIR (passive infrared) sensors, which can be set off by a gust of wind or a ray of sunlight. However, since you intend to use this inside a garage, that won’t likely be an issue. But I did just want to mention that the aeotec multi sensor is rated outdoors by the manufacturer for temperature, light, and humidity, but not for motion. It should be fine in a garage, though.
The Hue Sensor
The hue outdoor sensor is quite popular in the community, and is generally a good choice, but if you want to use it with smartthings you connect it without going through the Hue Bridge. And that requires custom code. So once you have it set up with SmartThings, you can no longer use it with HomeKit or the Phillips hue app or anything which requires the hue bridge even if you separately have a hue bridge on your smartthings account.
So it might work for you or it might not, but I did just want to mention that.