Of course it would. But it basically makes Sasuke irrelevant. He'll get utterly stomped. I've always stayed away from the SM+BM combination for the overlapping power variables.
Let's do some hypothetical math:
Sage Mode amplifies Naruto's techniques by 3 (x3 multiplier)
Bijuu Mode amplifies Naruto's techniques by 5 (x5 multiplier)
Bijuu Mode has been shown to match 6 combined Bijuu dama's and this is only half of it.
Sage Mode gives:
Advanced sensing to the best sensor in the manga.
Immensely powerful Taijutsu that doesn't even need to hit an opponent to work.
Reflexes that rival if not surpass the Sharingan.
Amplification of all Ninja Techniques (Ninjutsu, Genjutsu and Taijutsu)
Super Strength with the ability to lift things on an unquantifiable level (the Rhino in the Pein fight was roughly 10000 pounds)
Bijuu mode (50%) gives:
More advanced strength (shown when he was in mere KCM mode and effortlessly crushed rocks by touching them).
The fastest foot speed feats in the manga.
Access to Kurama's defense cloak which was able to tank Juubi's laser.
Access to Mini-Bijuu dama.
Access to Bijuudama.
Access to Continuous Bijuudama.
Now put that ALL TOGETHER and multiply the multipliers (on a hypothetical scale) with 100% Bijuu mode.
That makes Rinnegan Naruto and Rinnegan Sasuke with PS look laughable.
Let's do some hypothetical math:
Sage Mode amplifies Naruto's techniques by 3 (x3 multiplier)
Bijuu Mode amplifies Naruto's techniques by 5 (x5 multiplier)
Bijuu Mode has been shown to match 6 combined Bijuu dama's and this is only half of it.
Sage Mode gives:
Advanced sensing to the best sensor in the manga.
Immensely powerful Taijutsu that doesn't even need to hit an opponent to work.
Reflexes that rival if not surpass the Sharingan.
Amplification of all Ninja Techniques (Ninjutsu, Genjutsu and Taijutsu)
Super Strength with the ability to lift things on an unquantifiable level (the Rhino in the Pein fight was roughly 10000 pounds)
Bijuu mode (50%) gives:
More advanced strength (shown when he was in mere KCM mode and effortlessly crushed rocks by touching them).
The fastest foot speed feats in the manga.
Access to Kurama's defense cloak which was able to tank Juubi's laser.
Access to Mini-Bijuu dama.
Access to Bijuudama.
Access to Continuous Bijuudama.
Now put that ALL TOGETHER and multiply the multipliers (on a hypothetical scale) with 100% Bijuu mode.
That makes Rinnegan Naruto and Rinnegan Sasuke with PS look laughable.