Let's see the settings of this match-up:
Striking power:
Sentry can two-shot Thor while holding back.
Thanos usually needs between 3 and seven attacks for the same result.
WBH most impressive feat is matching an amped Red She-Hulk while both gone all-out. This is hardly quantifiable. This resulted in destroying Umar's planet in the Dark Dimension however there was massive amount of Heat Radiation from She-Hulk and Gamma Energy from Hulk so it was hardly accomplished via striking power.
Physical strength:
Sentry's physical force is enough to stop Exitar, whom is mightier than the Celestial 4th host. Rogue, amped by the power of all heroes on Earth couldn't even slow him down so she was a non-factor.
Thanos is featless but physically stronger than heralds like Hulk (non-amped).
WBH has no feats but Hulk in less enraged states was able to move continents and to hold a mountain on his back.
Durability:
Sentry's durability weavers according to his mental state or his own wishes. Sentry understood that he can't be killed via physical means. He no-sells physical damages.
Thanos' durability is very high. Recently he was stopped twice by the ultimates despite the team having no herald-levels or high-tier heavy hitters. (Teen Titanized anyone ? XD). However he was able to endure Odin's attacks and to match briefly the depowered Titan.
WB Hulk was massively amped during that arc due to the massive amount of rage he could build via constantly fighting and let lose. He looks as durable as Thanos in his first appearance against Drax which resulted in the destruction of one planet.
Healing factor:
Sentry hands down. He can regenerate his body from complete disintegration near-instantly.
WB hulk is clearly above Thanos. The more Hulk is angry, the faster he regenerates. Savage Hulk has better feats than Thanos.
Thanos don't have much feats of regenerating himself. Destroying his head or taking off his heart is enough to kill him.
Telepathy:
Sentry is near-immune to telepathy and omega-level telepaths can't enter in his head without his approval. He wiped out the memories of everyone on earth and Moon (Uatu the Watcher included) on a whim. Attacking his mind always end very bad for people trying it.
Thanos is a powerful telepath. He has beaten Hulk this way. He has beaten Monica Rambeau this way to prevent her frying his brain. He has been beaten by Silver Surfer on the Astral Plane.
Hulk has no telepathic powers but his rage was enough to push Prof X out of his mind however that proves that he can be attacked telepathically.
Telekinesis:
Sentry has stopped Mjolnir without trying this way.
Thanos has telekinesis but I don't remember how powerful.
WB Hulk hasn't.
Matter & Energy manipulation:
Sentry is more powerful molecule / reality manipulator than Molecule Man. He can manipulate all matter and all energy.
Thanos' powers over matter and energy are good. He was able to match a vulnerable and planetary-level Maker (extremely weakened Beyonder in mortal form).
WB Hulk cant manipulate this.
Energy projection:
Sentry has destroyed entire worlds while holding back.
WB Hulk has destroyed a planet during his clash with RSH.
Thanos doesn't have the power to destroy a planet on his own.
Special moves:
Sentry can charge at extreme speed via flying. He can use Infinitendrils of Negative Energy.
Sentry outclasses everyone here easily. He curbstomps.