First, glad that you did not fall for '256GB is enough' misleading suggestions. I hope you now understood why I went with 1TB (as it is a MBP and I cannot carry it around with an external drive plugged in all the time). Do not waste your money on TB4 enclosures '
yet'. Cheap ones come with lot of issues and last thing you want is for your data to go corrupt. Can you share screenshot of your mac's storage page from settings? Lets see how you can free up onboard storage without spending too much. Why go with TB4 enclosures and all if there is possibility of going for normal external SSD.
Also, Apple does not like USB 3.2 as much as Thunderbolt, thanks to lack of support for USB's 2x2 standards that allows higher speeds. Look for Samsung T7 vs T9 speed comparisons on mac. Not much difference though T9 advertises double the speed in normal operations. The key difference is when you transfer huge amount of data that needs more cache (T9 has some 120GB cache, T7 has 50GB I think). So, unless you use the same drive to record log from iPhone etc, think again about spending so much for USB 3.2 external storage. If you really want fast SSDs, check Sandisk's G40 that support TB3. To get best possible speeds, you have to shell out a lot for USB4 or TB4 storage. IMHO, not worth it unless your job depends on it.
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