Note that the Booking.com reviews are also less obviously spammable than TripAdvisor, since you have to actually have to make a booking to review a hotel. TA r

Note that the Booking.com reviews are also less obviously spammable than TripAdvisor, since you have to actually have to make a booking to review a hotel. TA reviews in general have a lot of sampling bias involved from solicited reviews (or just flat out fake reviews). On the other hand, do note that the Booking.com review scale is skewed - it's seems to actually be a 2.5-10 scale. The median rating is something like 8.1, so keep that in mind if you're using the review scores.