The Nonnaspin mobile casino runs on one account, so your balance, bonuses and verification stay the same whichever way you open it. The app sits on your home screen and reaches the lobby in one tap, and it can remember your login so you skip typing the password. That convenience takes up some storage. On Android, new versions come from the official site, so you install updates yourself.
A browser needs nothing installed. You open Chrome or Safari, tap a bookmark or type the address, then log in, which comes to roughly three or four taps before the games appear. Games load from the same servers in both cases, so loading speed depends mostly on your connection, not on the version you use. Older phones with little free memory, or work phones that block file installs, will usually run the browser version without trouble.
If you play several times a week, the app saves taps and is the easier pick. Playing now and then, sharing a phone or running low on space points to the browser. Same casino, different doorway.
Nonnaspin is for players aged 18 and over. Gambling carries a real risk of losing money, and neither version changes the odds of any game.