Ok, so there are basically two types of hacks for the Vita: PSP Mode, and native Vita mode.
PSP mode is a sandboxed mode design to run using original PSP hardware, at original PSP specs. This means you're limited to the PSP's 333mhz MIPS SoC and 32-64MB of RAM. Adrenaline, ARK, and VHBL are all PSP mode hacks that allow you to use PSP software only. Adrenaline is a full fledged PSP mode CFW, it essentially gives you the exact same access as a normal PSP would, including homebrew and PSP/PS1 games. ARK is a lesser CFW that has access to PSP backups and homebrew, and sound-less PS1 games. VHBL only gives you access to PSP homebrew, period. Again, note that these three hacks are limited to the PSP mode sandbox with limited hardware access, meaning emulators aren't using the full Vita's power.
Then there's native Vita hacks. There are two major releases, Rejuvenate (which is obsolete), and Henkaku, which is the latest and best Vita hack which you say you're currently running. This gives us virtually complete access to the Vita's hardware, which includes 512MB of RAM, the quad core 444mhz ARM CPU, and the PowerVR GPU. We also get Vita backups and Vita homebrew to run, which can take advantage of this bump in hardware specs for better emulation and homebrew.
If you have Henkaku, then there's no reason whatsoever to use VHBL for any PSP homebrew, period. You could run all the same things in Adrenaline, which you have, with no problems whatsoever.
If all you want is emulation, then I suggest you look into installing Retroarch on your Vita:
https://gbatemp.net/threads/retroarch-libretro-thread-ps-vita-edition-nightlies-included.437034/ < This gives you access to a ton of different emulators for various systems, most of which generally run better than in PSP mode.