It seems counterintuitive but the strongest tidal effects are with smaller black holes.
https://en.wikipedia.org/wiki/Spaghettification#Inside_or_outside_the_event_horizon
ETA: Tidal forces scale as M/r^3 where M is the black hole mass and r is the distance from its centre. However, the Schwarzschild radius R (the distance from the centre to the event horizon) is proportional to M (because R=2GM/c^2) so at the event horizon the tidal force is proportional to 1/M^2.
https://en.wikipedia.org/wiki/Spaghettification#Inside_or_outside_the_event_horizon
ETA: Tidal forces scale as M/r^3 where M is the black hole mass and r is the distance from its centre. However, the Schwarzschild radius R (the distance from the centre to the event horizon) is proportional to M (because R=2GM/c^2) so at the event horizon the tidal force is proportional to 1/M^2.
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