Is the Yamaha DTX8K-X worth the extra $1100?

If tcs heads on snare and toms (real acoustic feel) and dtx-prox module with slider-based kit mods matter to your playing, yes. The delta buys you real upgrades, not just branding. If you don't need those specific features, the Roland TD-17KV2 is the smarter buy.

Which is better for beginners?

For someone transitioning from a starter kit, both are solid choices. If Bluetooth and app connectivity matter to you for lesson content and track playalong, lean toward Roland TD-17KV2.

Can I connect either kit to a DAW?

Yes — both. The Roland TD-17KV2 and Yamaha DTX8K-X both offer USB-MIDI, so you can plug directly into any modern DAW without additional hardware.

Which has better pad feel?

Both offer good pad feel at this tier — the Mesh pads on Roland TD-17KV2 versus the Mixed pads on Yamaha DTX8K-X come down to personal preference. If you've played both, trust your gut on which surface you liked more.