I've been a professional C, Perl, PHP and Python developer.
I'm an ex-sysadmin from the late 20th century.
These days I do more Javascript and CSS and whatnot, and promote UX and accessibility.
As you say, it really depends what kind of development you're doing.
I have three machines here, a 3rd gen i7 PC, a 2nd gen i5 laptop and a 2020 MBP. There's nothing I can't do that I need to do any of them, and the i5 is a decade old. It didn't cost me anything, because someone wanted rid of it. The desktop PC is a mishmash of parts but probably cost about $4-500 in your money units all told. It's not a laptop, but it has two 24" monitors and a properly keyboard and mouse, so...
The "best" computer for someone is always going to be a value decision.
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As you say, it really depends what kind of development you're doing.
I have three machines here, a 3rd gen i7 PC, a 2nd gen i5 laptop and a 2020 MBP. There's nothing I can't do that I need to do any of them, and the i5 is a decade old. It didn't cost me anything, because someone wanted rid of it. The desktop PC is a mishmash of parts but probably cost about $4-500 in your money units all told. It's not a laptop, but it has two 24" monitors and a properly keyboard and mouse, so...
The "best" computer for someone is always going to be a value decision.