Shock! - service or replace for cheaper

Got a 2015 fox float Factory CTD w/Boost valve shock that needs its second major TF tuned service in two years. The service costs just over £100. The shock is pretty old now so have considered buying a new (but older) shock which actually works out at a cheaper cost......
Choice options
ROCKSHOX Monarch RT
Fox Float Performance (NON boost)
Both £99.99
Will a new - but slightly less capable shock still be better than my beaten shock even after a service?
Will I even notice?
An it's not really a forever shock anyway, Would like to think i'm due a new bike towards the end of next year....
OPINIONS PLEASE
Mainly riding Trail & bike park. BPW, AFAN, Coed y Brenin, Chicksands, Woburn. That sorta vibe.
Choice options
ROCKSHOX Monarch RT
Fox Float Performance (NON boost)
Both £99.99
Will a new - but slightly less capable shock still be better than my beaten shock even after a service?
Will I even notice?
An it's not really a forever shock anyway, Would like to think i'm due a new bike towards the end of next year....
OPINIONS PLEASE
Mainly riding Trail & bike park. BPW, AFAN, Coed y Brenin, Chicksands, Woburn. That sorta vibe.
It matters not, win or lose, it's how you ride the bike
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Posts
Service through TF (by some way)
New Fox
New RS
Deviate Guide
Specialized Sequoia Elite
Pivot Mach 429SL
Trek Madone 5.2 Di2
Salsa Mukluk Carbon
Specialized Turbo Levo Expert 29er
Having used TFT recently, I'm quite happy to keep sending back my 6 year old shock and forks. They come back pristine.
Your new, cheap shock will need servicing at similar cost and intervals to your old shock. Why compromise on performance to save a few quid?