What is the correct way to name classes?

Question

PHP

1.

/src/

<?php

namespace App\Entity;

class Unit
{
}

<?php

namespace App\Entity;

class UnitType
{
}

2.

/src/

<?php

namespace App\Entity;

class Unit
{
}

/src/Unit

<?php

namespace App\Entity\Unit;

class Type
{
}

The second option is more logical, but there is information that the first is preferable, is it?

It seems like when using the first option, there will be conflicts when establishing links, for example

use App\Entity\Foo\Type;
use App\Entity\Bar\Type;

Those. will need to be written

use App\Entity\Foo\Type as FooType;
use App\Entity\Bar\Type as BarType;

I would like to get an answer from experienced developers. How is it better? Can't find PSR advice on this