What specific performance differences are you expecting or concerned about?
Broadly speaking, pretty much any properly designed IEM system, from entry-level to high-end can work perfectly well, especially in the context of small gigs. In typical, non-challenging environments, meaningful differences in "performance" aren't likely to stand out. Differences start to matter when the operating environment becomes challenging. And in general, higher price tends to correlate with greater ability to handle challenges with features (mainly/solely UHF) involving wider operating bandwidth, more available channel presets, manual tuning options, auto-scan features, and higher and/or selectable RF power. If a system that can’t cope with challenges, that’s when people say, “this system sucks.”
UHF, 2.4GHz, and 5.8GHz IEM systems all have different strengths, limitations, and tradeoffs. Each band has its own susceptibility to ways of dealing with operating environment challenges.
I don’t have direct experience with the two specific models you mentioned, but assuming neither faces insurmountable challenges in a given case, the most noticeable differences between UHF and current digital systems tend to be user involvement in setup/channel selection and frequency response. Most current digital systems are pair and go. UHF systems usually require some level of manual frequency selection as well as it being a good idea to inform yourself as to the RF use in given areas (checking a frequency finder before going). If you don’t view that as a hassle, then this difference may not matter to you. If you value quick, low-fuss setup, digital can feel significantly easier...it does to me. And analog UHF systems are limited by their architecture and often have LF rolloff specs as high as 90Hz. Digital systems are capable of passing a full-range signal. Personally, I only find LF rolloff differences are noticeable in sit-down A/B listening. On a gig, ambient bass (from PA subs and stage sound) overrides the perception of where the ears are rolling off. So, not very different for me, but if you want everything including true sub-bass passing through the IEM receiver, this could be a meaningful difference for you.
I think the bottom line is that either can be fine given ok conditions that are typical for small bar/club gigs. There are differences that can be subjective in their importance, but the real differences tend to show up when conditions get complicated and they can be crippling on either side with the answer being to throw money at it. I have a super cheap UHF system that I bought on a lark just to satisfy my curiosity ($89 that I paid $30 for because I had some Amazon points) and so long as one of its 10 fixed frequency presets is clear, it works just fine. Would that be enough to take it out on a gig? Hell no. But I bought it with the expectation that it would be riddled with interference or somehow sound obviously cheap...if it has a clear signal, it's perfectly fine.
