Drop saw for deck???

Time to start on the next project. It will be a deck laid over an existing concrete slab.

I'm on a tight budget but am I on the right track that a drop saw would be best for docking the deck timber??

Choice 1.
Cheap Ozito drop saw (under $100)
Mid priced Ryobi/Bosch (at least double the el cheapo price)

Choice 2.
More expensive option of sliding drop saw.

Facts.

Will not be cutting 4x4's. Mainly thinking of using it just for the decking.
Will hardly use again after the job.
Is there a vast difference in the "squareness" or quality of cut between the el cheapo or the other choices.

Thanks for info.....


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