Been through this exact search a few times on my own cues. Elkmasters are great when you get a good one, but consistency out of the box is a coin flip; some are dead solid, and some are mushy after a rack or two. Triangles are the more reliable middle ground; they hold shape longer, and the hit is a bit more predictable rack to rack. Ki-Tech is a fine shout too; a lot of guys on tour switched to those for the durability without losing much feel.
If you want a single layer that splits the difference, try a Triangle first since parts and replacements are easier to find than ElkMaster's these days. Whatever you land on, get it installed by someone who does a lot of tips; a bad install ruins a good tip fast.