Is the Yamaha DTX8K-X worth the extra $1500?

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 Yamaha DTX6K2-X is the smarter buy.

Which is better for beginners?

Both are solid upgrades from entry-level kits. Your choice should come down to which module and pad feel appeals to you more — there's no clear beginner-friendliness winner at this tier.

Can I connect either kit to a DAW?

Yes — both. The Yamaha DTX6K2-X 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 kits use similar pad technology at this tier. If you want to dig deeper, look for dual-zone capability — it lets you cross-stick on the snare, which makes practice sessions feel more like playing an acoustic kit.