Quick question on starter types, 60's vs 80's

[thewrai6th]

I have a 1984 350 engine bolted to a 1969 3 speed manual transmission/bell housing. I have been having trouble with the starter recently. It worked fine for about 1 year. I think it's twisting when it starts 3 or 4 times because I keep having to unbolt it and bolt it back up. In the process of grinding and whatnot, I screwed up the starter and it barely turns the engine over now.

I was going to get a new starter, but I saw that the original starter has 3 horizontal bolts to the transmission, vs the starter I have is 2 vertical bolts into the block. Any advantage over using one or the other?