Cheapest method to use Bitcoin for small purchases?

I mostly use Bitcoin to make smaller purchases ATM, as some vendors only use BTC. My last withdrawal/purchase with BitBuy had horrendous fees.

My friend suggested I use Kraken Pro to deposit my fiat currency and transfer a larger amount to Trust/Phantom, so that the fees were smaller in relation to the amount. Then make my purchases with Trust/Phantom, so that I only pay network fees. There is also Moonpay, but they want 1% for deposits. NDAX has free deposits, but has higher withdrawal fees.

Any preference for Phantom vs Trust? I know Phantom has a cleaner UI, but Trust allows for more currencies. Any other suggestions for an exchange or other strategies?