This is taken from the store descriptions:

DLC Set

DLCs included:
• Deluxe Pack
• Bikini Outfit: Goddess Set
• Bikini Outfit: V-Idol Set
• Swimsuit Outfit: Goddess Set
• Swimsuit Outfit: V-Idol Set
• Bunny Outfit: Goddess Set
• Bunny Outfit: V-Idol Set
• Deluxe Item Pack
• Item Booster Pack
• Unlock All BeatTik Songs
• Unlock All BeatTik Dances
• Extended BeatTik Dance Pack

VIP Edition

DLCs included:
• Deluxe Pack
• Bikini Outfit: Goddess Set
• Bikini Outfit: V-Idol Set
• Swimsuit Outfit: Goddess Set
• Swimsuit Outfit: V-Idol Set
• Bunny Outfit: Goddess Set
• Bunny Outfit: V-Idol Set
• Deluxe Item Pack
• Item Booster Pack
• Unlock All BeatTik Songs
• Unlock All BeatTik Dances
• Extended BeatTik Dance Pack
• 19x Vtuber Themed accessory and item packs

The VIP edition has the extra 19 VTuber accesory Packs, besides that, they are basically the same.

Be aware that the VIP edition has 35 out of 42 DLCs. So after buying it you'll be missing 7 more DLCS.

DLCs missing from both DLC Pack/VIP Edition:

- Neptunia Virtual Stars - Towa Kiseki - Vtuber Accessories
- Neptunia Virtual Stars - Towa Kiseki: Swimsuit Outfit
- Neptunia Virtual Stars - Kizuna AI - Vtuber Accessories
- Neptunia Virtual Stars - Towa Kiseki: Bunny Outfit
- Neptunia Virtual Stars - Kizuna AI: Summer Style Outfit
- Neptunia Virtual Stars - Towa Kiseki (Character & Story)
- Neptunia Virtual Stars - Kizuna AI (Character & Story)

You'll have to buy these separately. I had to do that in order to get all the DLCs.

Hope it helps :D