All Cherry mx switches share the characteristic of increasing force past the actuation through the entire displacement to bottoming out. Some, such as browns and clears, have grafted a cam onto the switch stem to give the impression of a tactile bump. In contrast, IBM buckling spring switches undergo compression until a catastrophic collapse of the spring, which is accompanied by a vertical drop in force. Because of these differences in mechanism and force-displacement behavior, no Cherry mx switch feels like an IBM buckling spring (either membrane Model M or capacitive Model F).
Next to the IBM Model F capacitive buckling spring, my own preference is the Topre switch, especially the 55g variety. This involves increasing force until the rubber dome collapses, with decreasing force until nearly reaching the bottom of the displacement. The feeling is similar to that of tripping a weighted piano key.
If I were not able to use an IBM Model F or Topre keyboard, my next choice would be Matias tactile/click switches. If it had to be relatively quiet, I would go with Matias tactile silent switches. Other possibilities (but available only in vintage boards) would be Monterey blues, orange, black or white Alps, or NMB Hi-Tek "space invader" black or white switches.