3-2 will sound like a fairer result, but as people have said it's a dead rubber, England won't put in as much effort, India have nothing to lose. And 3-2 with a win in a dead rubber is worse than a 3-2 with both wins coming when series was alive.
India are unlucky to be 3-1 here, and it will be a bit of a shame if they walk away with a 3-1 or even 4-1 loss, the series was much closer than that. So 3-2 will be fairer.
For me though India will be looking at this and thinking it was a chance gone begging, a drawn or even a win series was entirely possible. Two close games they could have won had the rest of the batsmen stood up. England have not batted well either, and it's their lower order which India failed to get out cheaply which has been the difference. I am really astounded by the lack of performance by England's specialist bats, it's home conditions, you really would have expected more.
It feels a bit like when we drew in England in 2016 2-2. Wasn't a bad result, but Pakistan were the better team I thought and we should have grasped that series win. We just choked it out in that fatal match, we squandered and over 100 run first innings lead, and just collapsed in the second innings when we could have batted it out for a draw if we held our nerve. Again kind of felt like a chance gone begging.