Just from the title alone… I wanted to ask what possibly the best wallet to hold bitcoin in?
Before anyone says that it depends on what I need specifically then here is what I am here for. I can not decide which one really is the best based on the things I want. First of all I plan on holding some bitcoin (not huge amount) for a foreseeable future. However I also plan on swapping it for usdt from time to time aka when the price is getting high. I need a wallet that has low fees when swapping , preferably decentralized and in mobile and is secure.
Any recommendations?
There is no such thing as a low-fee bitcoin wallet, the fee depends on the current transaction flow of the network, the wallet is just a tool that allows you to store private keys (or descriptors) and some allow you to customize the sending fee.
I recommend Bitcoin Core for you, you can run it with or without pruning, if you want to exchange BTC for USDT, you can use
https://exch.cx a swap exchange.
For USDT I can't recommend any, as I hardly use any other coin other than Bitcoin, but if you're going to use the ETH network, there's MEW... However, if you're going to use more than one currency besides Bitcoin, I recommend you get a Trezor right away.