I have tested both BCD436HP and TRX1 models. I assume the 3600 will be similar in performance to the 436.
Here are my views (...and I'm sure others will have their own opinions, to which they are of course entitled to air):
- Overall, the Uniden is a superior scanner for functionality/ease of use vs the TRX: The Uniden feels like a 'proper' high-end scanner: I'd say slightly more complex than a Uniden 3500 to use, but with DMR. The Whistler feels a bit more like a prototype.
- The software for programming the Uniden is vastly superior. The Whistler EZScan software is pretty dire.
- The Whistler is really only geared up for scanning but not searching - in comparison, it has VERY limited tools and functionality to make it easy to search for new channels. Don't forget that these scanners are geared towards the US markets and come with a regularly updated US database to scan: so they are Scanners. I know many folks here will use their receiver for a combination of scanning and searching.
- The startup time/time to load a reasonable sized scan list in the Whistler can be anywhere between 1-2 minutes. The equivalent in the 436 is a few seconds.
- The Whistler is slightly more sensitive than the Uniden. For those familiar with the Uniden 3500, I would say the 436 is similar to it, perhaps a little bit better.
- Both are good at decoding conventional DMR repeater signals, with excellent voice decode quality.
- The Uniden is superior for properly decoding and following the various types of DMR signalling (Trunked, XPT, TIII etc).
- However, the Whistler is highly superior for DMR Simplex/uplink signals where the Uniden often struggles, in particular on VHF channels.
- Relative to the TRX-1, the 436 uses up the batteries more than the TRX1 (but then it has 4 of them!)
- The UK bandplan for the TRX still isn't correct: it means there are some VHF channels that cannot be received/decoded.
- You cannot change the modulation or frequency step size on the TRX.
- I prefer the ease with which recording is enabled on the TRX (it just works), but the recording capabilities and ease of playback on the Uniden are superior.
- The Whistler decodes NXDN. The 436 doesn't (yet - and might not ever get an upgrade to decode it)
- Uniden's Close call will DETECT pretty much every signal type (DMR/NXDN/analogue) except DMR simplex. That's actually no different to any Uniden with Close Call. The difference with the 436 is that it now decodes DMR Close Call hits. The TRX just does a very fast spectrum search, so will normally hit on all signal types eventually (assuming step size/modulation are ok) including DMR simplex. In fairness to the Uniden, Close Call is highly superior, and if you knew which frequency band the DMR simplex radio was on, you could just as easily do a band search to find it.
In summary, I'd say neither is perfect. But I really prefer the Uniden, and end up using the Whistler to scan some frequencies that I've found using the Uniden.
Hope this helps.