Not to shill my own stuff, but I did a demo piece using the Berlin Orchestra add-on for MuseSounds that has received a lot of positive feedback for its capabilities while being under 100$.
Compare this to another piece I did that uses almost all vanilla musesounds.
My opinion:
Vanilla Musesounds has a lot of problems. There are nasty artifacts in crescendos and diminuendos, the trumpets and trombones are frankly awful and the dynamics are all out of sorts.
Berlin Winds/Brass/Strings are considerable improvement, but still suffer from odd glitches (first note in the brass is often louder than the rest for no apparent reason), and the dynamic balance issues of Musesounds.
Now, compare that in a shootout to the kontakt libraries I used on my recent album
To my ears, even the add-ons to Musesounds — mostly — cannot compete with that.
Neither the logic stock orchestral sounds nor BBCSO Free (which only has 1 dynamic layer) will be able to beat Musesounds, but neither of the previous can beat a well crafted performance of a strong composition in a DAW with quality Kontakt libraries.
IMO, if Kontakt libraries are out of reach for you, I would consider buying the Berlin series for Musescore, and then exporting the audio from it to manipulate further in logic with better reverbs or helping the dynamics out by adding fades manually.