Are you ready..thighs are my best area, haven't done squats with serious weight in over 25 years, since the early 80s. All the size was built in the last half of the 70s and they stay big just from cardio.
When i did them, the best results were from box squats, reps 8-12. Not too low on reps because the knees will be susceptible to problems, and moderate reps work best for size. For legs you should also sometimes try higher reps and see what that does for you, 15-30 for example. Try both and decide. About 2 minutes between sets. Warmup of 3-5 minutes before all this is key, including stationary bike if possible.
Then add leg press after squats, then some leg curls for hams. 4-5 sets per exercise. I did leg extensions for years and in hindsight don't believe they were worth the effort, just as i say now that less volume's effective in general.