We've had the TH2830 almost 3 years now and no complaints, it's quite good, stable, quiet and we've written some Python code to allow plotting. Very nice instrument, well designed, quality constructed and overall good value IMO.
If you check the specs the LCR-6100 goes to 10Hz, where the TH is 50Hz, the TH2830 has no DC Bias (however the more expensive TH2832 does) while the LCR-6100 has DC Bias to +-2.5V.
Here is US the LCR-6100 is ~$1700 whereas the TH2830 is ~$900, so for us the choice was the TH2830, however in your case they are equal priced, so that's worth considering!!
Best,