Even if they were in the same terminal, I would choose the SC. The LGA CL is usually packed to the brim (made worse by low ceilings) and the food is pretty sub-par for a CL.
It's funny, I would say the LGA CL is exactly par for the course for CL food across the network today ... it's just that CL food across the board is meaningfully less exciting than what was being offered at most CLs 5 years ago. But agree I would not bother with it vs. the LGA SC, especially since the LGA club has some of the best SC food across the network.
If you had access to the new Chase Sapphire lounge, it would be a much tougher choice in terms of amenities, although that lounge is also quickly reaching uncomfortably crowded territory. (Though it has not yet had, but will presumably soon have, the densification-of-seating treatment that so many popular lounges have gone through in recent years.)