Check out the YouTube video for sound performance comparisons!

Specifications

Comica Vimo Me, $70-90 https://link.amazon/B0bjcwQQu

  • 2.4GHz dual-channel wireless transmission
  • 48kHZ 24Bit recording
  • Digital and analog receivers
  • 8.5 hours of use
  • 34 hours of use with the charging case
  • comes in camera kit or USB kit
  • CalMix noise reduction
  • Stepless mechanical gain
  • up to 300m transmission range
  • 115dB SPL
  • Each mic is 9.3g

Hollyland Lark M3 $~100, https://link.amazon/B06YooRRB

  • 2.4GHz wireless transmission
  • 48kHZ 32-bit float broadcast audio (only for iOS)
  • AI noise cancellation
  • up to 4 transmitters and 4 receivers
  • up to 4 independent tracks
  • 8 hours of use
  • up to 24 hours with case
  • up to 300m transmission range
  • 125dB SPL
  • Each mic is 9g
  • App for tweaking sound and settings

Both microphones are small and easy to hide. They attach to clothing with magnets instead of the usual clips/clamps that most other larger wireless microphones use. The size, battery life and configuration options for the number of transmitters/receivers in a kit are very similar. The differentiator between them will come down to which one sounds better to you, which one reduces sound more effectively, and/or whether or not having an app is important to you.

The Hollyland Lark M3 has an app wherein you can control sound and settings such as noise reduction and bitrate. The M3 can operate in 32-bit float mode on iOS devices, which means you won't have to worry about clipping. This is not available for Android devices; the app informs you it isn't possible should you try to enable it with an Android device.

I preferred the sound of the M3 out of the box, but both microphones do a similar job at reducing ambient noise. When testing the microphones outside, neither of them completely eliminated loud street noise like noisy car engines but they both remove the background sound of being out in nature. Light wind, the sounds of animals scurrying around - all this is removed. You're left with a very quiet audio canvas for drawing pictures with your voice if you're recording outside. But with the app, you have more opportunity to tweak the sound further of the M3 than you can with the Vimo Me.

In that regard, the Hollyland Lark M3 is probably the better buy here if adjusting sound and settings is important to you. If this doesn't matter, you could save $10 or more depending on the kit you get by buying the Comica Vimo Me instead. The base Comica kit also comes with the extra camera receiver, which might be worth it if you intend to connect to a phone and a camera on a regular basis.

Do check out the video to hear them for yourself.