[TurboKraft]

K27-7200 based:
Upgrade yours to double billet internals -- billet compressor wheel, and very lightweight high-flow turbine wheel.
+ Good for all-out CIS or mild EFI builds.
+ Exact bolt-in fitment because K27-based
- Limited by that turbine housing -- backpressure on 450+hp EFI engines
- Replacement housing parts are practically non-existent. Need a new turbine housing? Good luck, indefinite backorder, if not simply NLA.

Garrett:
The GT35R is still the best all-around turbocharger, more responsive than a K27 and flowing more cfm than CIS will reasonably support, capable of 620whp on EFI engines.
Their new Gen2 GTX3582R has a lighter billet compressor wheel and increased efficiency at our low pressure ratio so finally, the billet wheel is a worthwhile upgrade over the cast wheel.

Also, still highly configurable, ex: different A/R turbine housings, v-band outlet available, T3 or T04 or v-band turbine inlet, etc.

BorgWarner:
So far, the EFR's haven't performed well enough to justify their expense and additional custom fabrication.
Some guys still swear by the S300 series (think Tippy is running that).