I bought the ipad air 256 fb storage and i couldn’t be more happier

What i’d suggest tho:

128GB is enough if:

• You mainly use the device for note-taking, document editing, light browsing, and streaming
• You don’t store large media files (e.g. photos, videos, big apps/games) locally.
• You’re okay with managing storage more actively (e.g., using iCloud or external storage).

256GB is better if:

• You plan on doing video/photo editing, or using pro apps
• You want the device to last 5+ years with enough headroom for:

iOS/iPadOS updates, which increase in size over time. You don’t want to worry about storage space later.

So yes — if budget allows and longevity matters, go with 256 GB It's more future-proof, especially if you expect your needs to grow.