The sds 100/200 does good with simulcast.
The guy you went to sounds like a derp and just wants to push you to be a whistler fanboy like he is. I have a trx1 and a sds100, love them both for different reasons.
trx1 pros would be free nxdn / dmr - doesn't trunk track but you can follow if they don't talk often. Easy to program and you can select what youw ant to record. AA batteries so you can buy them if yours die at any store
cons would be it doesn't do simulcast very well if the signal is strong - I don't have any issues and it keeps up with the sds100 in my area(everyone is different).
sds100 pro is the color screen, does simulcast very well, really well custom channels and quick keys which I think is a neat concept(I haven't used it yet)
cons - You have a battery pack so no AA batteries like the trx. Seems to die pretty quickly(give or take 5-6 hours) gets very warm quickly, the sma goes inside the scanner making you have a few antenna choices or get the sma to bnc and open your options up. When you record, you record EVERYTHING unlike the trx with the rec option on each entry
[[ ALL IN ALL BOTH ARE GREAT SCANNERS FOR DIFFERENT REASONS ]]