Yes, Sasuke does love Sakura. He was too focused on defeating Itachi as a kid to pay her much attention, but the two finally develop a companionship in their late teens. Sasuke is more open about loving Sakura now that they’re adults.
Sasuke has much more chakra, but Itachi is more intelligent. Sasuke’s faster than Itachi but both their sharingan can read movement. Sasuke’s Susanoo sword is just as much an instant kill due to the Amaterasu flames the sword can produce, but Itachi has the Yata mirror which gives it better defense.
Clearly, Senju is a shinobi who is more powerful than Sasuke. The question just becomes how exactly he is stronger than Sasuke? Well, his talent at transformation techniques and Bukijutsu definitely surpasses Sasuke. Senju was so good at these two techniques that he used them to control the tailed beasts.