UK Question: Which crypto wallet is best?

I'm relatively new to buying crypto myself, so i'm still learning about it all.

I started buying on Coinbase and transferred to to my wallet, I then realised that I could buy coins on Trust Wallet, so I'm going to do that instead and save the extra fees.

I've also got an Upload Wallet which is connected to Brave browser for the BAT I can earn from it, I have wallets elsewhere but never used them as I didn't know which one was best to use, can anyone advise which out of Trust wallet and Upload is better and cheaper to buy crypto, or if there was a better one out there, yes I am looking to buy a cold wallet so it will need to be compatible with it?

I've also noticed on two platforms that there is a slight difference in value on the price of crypto, will this be typical on all the wallets?

Any help or advise is appreciated!