Buying Telegram Stars works the same way whether the payment goes out in TON or TRX — enter a username, choose an amount, and pay. The real difference between them comes down to which wallet already has funds.
Whichever of TON or TRX gets used, both skip the card-payment review process entirely — the only difference between them is which wallet already has funds.
Anyone holding both TON and TRX can switch between them freely at checkout — just make sure the payment goes out on TON mainnet or TRON, matching whichever asset is chosen.
It depends on current network fees on TON mainnet and TRON, not a fixed difference — check the fee shown at checkout for either.
No, TON mainnet and TRON each charge their own transaction fee on top of the order, separate from the Stars price.