Since you’re just starting out, some context and history around your choices might help.
I’d only refer to 100% live ocean rock as rock that is sourced directly from a tropical reef. Generally Australian or Indo Pacific. Once the established norm but now harder to source and very expensive in Nth America. Still the gold standard, imported from the reefs that you’re trying to recreate. Likely reasonable die off due to shipping time, chance of undesirable hitchhikers.
Live maricultured rock from the gulf. It’s been around for a while. When 100% live ocean rock was plentiful and the norm, gulf rock was probably unfairly considered to be its red headed cousin. Its prestige has increased considerably since, basically because it’s the next best option for live rock aficionados. Less die off due to reduced shipping time, chance of undesirable hitchhikers.
Dry rock is either mined ancient reef rock or manufactured. Often coated in purple to mimic the look of live rock, some feature bacterial coatings that purport to add life. Be sceptical of these claims. You’re effectively starting from a biological zero point. Has also been around for a while, In the ‘rock wall’ days of aquascaping many used dry rock as base rock under a top layer of live rock. Dead start, no chance of hitchhikers.
You can achieve success with all of these options or a combination of each, but also failure. The failure rate cited with dry rock starts seems a bit misleading. I remember plenty of issues on forums when 100% ocean live rock was the norm. Now, dry rock is almost the norm so no surprise that there are plenty of failures using it too. Understand the differences of each and the precautions you should look at to prevent the common issues encountered with each type of rock.
Hope it goes well whatever you choose.