Well there are advantages to both, cost, ease of use, ability to do multiple batches. Hmmm we still ponder the level, when really that should be the easy question. The hard question is to go gas or electric, or both. What is your budget? I mean w/ $400 you can go all gravity and transfer by hand. For $3400 you can go single tier 2 pumps, automate the damn thing, and add a little fermentation. Electric gas and beyond.
I have been designing a few systems lately for people and I have discovered that everybody has a different need. What is yours? Go with what you want and what fits your budget. Or just go w/ what’s cool. But if you lean toward what fits your needs then your on target and none of us know what your needs are. I like the 3 tier gravity, pump driven, single grant systems myself. But that’s just me. Major advantages over the others, some drawbacks (I think).
Good luck on your build
Jay