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The ADS1261 has several additional features, including:
An internal 2.5V reference
Faster data rates up to 40 kSPS (ADS1235 max data rate is 7.2 kSPS)
Up to 5 additional analog inputs
Additional PGA gains (between 1 and 64 V/V)
Programmable IDAC current sources
Burn-out current sources for open-sensor detection
VBIAS level shifter
Apart from those features the devices are very similar. If a customer is doing a bridge sensor measurement and doesn't require the internal reference, intermediate PGA gains or additional analog inputs, then the ADS1235 is a great fit. However for RTD, thermocouple and higher channel count applications, I would reccommend the ADS1261.
