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My usual anser is: "it depends". If you want to be absolutely sure no chain analysis company can access this data, you shouldn't use a public Electrum server. But considering Electrum's popularity, I don't think that's a concern to most people.
When you use Bitcoin Core, you can also reduce your privacy by linking different addresses together on-chain.

Ok thx, I will weigh the pros and cons

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I think it's about 1-2 GB download per week. But if you allow incoming connections so your node is also uploading, you can transfer much more data.

Ok thx, It gives me an idea

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As always, privacy comes at a cost. I wouldn't do it with less than 16 GB RAM, and memory consumption only gets worse in the future.

Yes, although I'm not planning to run the node continuously (I know it would be better for the btc ecosystem / community)

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A quick search shows it's "an offline phone". I wouldn't risk my money on that.

Why not ? I mean the main question re security is having your key offline, isn't it ? What would be your top 3 in terms of hardware wallet / storage ?