I'm starting out with a disposable (aka shavette) blade straight razor myself and I will purchase my first straight razor. My biggest problem with the shavette is that the blades I use are DE's cut in half and when placed in the holder, the corners of the blade protrude and I need to be more careful during shaving so the corner does not catch my skin and cause a nick. Nevertheless, it's an inexpensive way to see if you like straight razor shaving. I have good days with the shavette and bad days........well today is a bad one, four nicks - comes with the learning curve and territory. I use the Personna blades because that's what I can find locally here in my area. I didn't want to spend too much money starting out. I'm ready to upgrade to a standard straight razor.
I'm sure there are other members who can provide you better information than me since I am new to straight razor shaving myself.