The cheap alu steerer one is still fine to ride, the majority of road bike out there have those kind of fork, even with steel steerer.
A full alu fork will be considerably harsh to ride, and not necessary to handle more impact.
If you really want a strong fork, your best option is to go for a Surly Steamroller fork, which then you might as well just get a full Surly Steamroller instead.
The cheap alu steerer one is still fine to ride, the majority of road bike out there have those kind of fork, even with steel steerer.
A full alu fork will be considerably harsh to ride, and not necessary to handle more impact.
If you really want a strong fork, your best option is to go for a Surly Steamroller fork, which then you might as well just get a full Surly Steamroller instead.