Buy the Novation Launchkey 49 MK4 unless you have a specific reason not to. 49 semi-weighted keys is the range most producers actually play in, the 16 pads carry the same Session View mapping as the rest of the family, and it's the modern form of the plain "Launchkey" answer the r/ableton thread kept naming. If you need more range without the SL MkIII's price, the Launchkey 61 MK4 is the same controller with 12 more keys for about $50 more.
Go smaller with the Launchkey Mini 25 MK4 if what you're carrying matters more than what you're playing, it's the same pad and Scale Mode toolkit in a bag-sized body. Step up to the 61SL MkIII if Ableton is only part of your setup, the 8-track sequencer and CV/Gate outputs earn their price when you're also running outboard hardware, and it's the thread's actual top vote. If Ableton control is the whole point and budget genuinely isn't, Ableton's own Push 3 is the ceiling, tethered, built by Ableton for Ableton, with 64 MPE pads and a built-in audio interface, at about three times the SL MkIII's price. For a pad-only workflow layered onto a separate keyboard, the Launchpad X and Akai APC Mini MK2 are both in our catalog and both echo the thread's clip-launcher answers, and the Arturia KeyLab Essential mk3 and Arturia MiniLab 3 are the non-Novation names the thread raised.
Basis: r/ableton, "Best MIDI keyboard controller for Ableton users?" (posted December 2023, 49 comments), ranked by upvotes: "Novation SL Mk3" (28), Minilab 3 (10), "Novation Launchkey MK3" (8), a general vote for Novation's own-brand integration (5), Maschine Jam for that ecosystem (5), Arturia KeyLab Essential mk3 (4), Ableton Push (3), Akai APC40 mk2 (2). Cross-checked against Amazon rating counts and prices as of August 2026. Specs are the manufacturers'. Ratings score each pick on the merits with price left out, so the premium pick sits highest, the tier only tells you where a pick sits on price. We track listings and prices; we have not hands-on tested these.