This question already has an answer here:
Each device will have a different SAR value and follow this side https://www.rfsafe.com/samsung-cell-phones-rated-lowest-radiation-cell-phones/ they have say low SAR phone better than high SAR phone
FACT: Users of the twenty highest SAR cell phones sold in the U.S. can absorb up to four times as much radiation in their heads as users of the twenty lowest SAR cell phones.
But in some side http://www.earthcalm.com/dont-get-fooled-sar-ratings they say New Information about SAR Ratings
Unfortunately, after the FCC’s initial report, new evidence came out about SAR in 2010, that a low-SAR phone doesn’t give you a safety advantage after all. In fact, it was determined that it can actually be worse than a high-SAR phone.
This is because some low-SAR phones emit higher total SAR in brain tissue than higher-SAR phones—it’s just spread out a lot more throughout your brain tissue.
And the reason these low-SAR phones emit higher total SAR is that they’re less efficient at getting their signal to the base station and so need to work at a much higher rate to compensate. The FCC finally admitted their mistake—but for some reason, the information didn’t get out well to the general public.
So if both phone is in the same environment, low SAR phone or high SAR phone will better for health? Or I can not compare it base on SAR value