These i would appreciate. The more exposure the Bitcoin logo gets, the better. Even if people don't know it yet, once they learn about it they might get a more positive reaction from having previously seen the logo ("brand" awareness).

If you add some message, it might be even better. Ie: "In code we trust", etc. But BTC alone printed on a t-shirt does wonders.

Hardware wallets, no so much. I think that's money better spent in either bitcoin or the aforementioned wearables.

Gifting an asic miner, well that's only useful for miners, i guess. I think its easier to just give them bitcoins and if they want to buy another miner they will.

Gifting a wallet with funds (the seed words) might be viable, if it comes with clear instructions. Do NOT use the term "paper" wallet as this refers to an older,  discouraged method that involves exposure of the private key, something you must always avoid.

If you want to gift a "wallet", in (physical) paper, just use the seed words (explain how important they are to keep protected). You may add some public addresses and QR codes if you want them to keep adding funds to it and keep it cold (and the instructions could even explain how to view the blockchain online).