doogiet.
re vst//vsti.

vst = things like applying a FX like echo or reverb or chorus or one of a myriad of fx out there to an audio track.
vsti = applying a instrument to a midi track.
NOTE...the advantage of the 'boring' coyote sounds is they dont need lots of computer resources.
wanna get song ideas down fast when you wake up at 3am in
the morning and you have a song idea ??
answer go midi/coyote...also allows moving bars around easily eg in
pg's realband. eg you like the midi solo notes played at bars 32 to 39 ?
but dont like what is genned for bars 65 to 72.
no probs in realband. just copy/paste the midi data.
if one is doing a ton of midi rb is ones friend because of its
extensive midi features rather than bb.
eg editing/changing things around fast when the muse strikes.
THEN...youre going i hate that cheesy coyote drum sound for example
in coyote...so one uses a drum vsti to replace the cheesy coyote
drum sound. just be aware instrument plug ins eg any instrument
you would find in a jazz band or orchestra it can take a looong time
to decide which sound one likes. because the vsti has sooo many
menu sound choices one can apply to any midi track.

THUS...lets say you have a hit jazz song idea...what i do on any song
is get the idea down fast useing the 'cheesy' sounds.
THEN replace with vsti's or real tracks. (note midi tracks take up teeny amounts of disc space compared to audio tracks.)
so if say you want a jazzy piano sound...replace with a jazz piano selection useing a vsti.
BUT...be aware sometimes a vsti can provide so many piano sounds you like or other sounds its darn difficult to decide which sound you want to use on the track. this happens all the time to me.
so i keep it simple useing coyote cos band mates might want a different arrangement at the beginning roughing out a song before bandmates input.

as to AUDIO TRACK FX like echo...do yourself a favor and instead of spending a ton of money on third party fx...
(ive seen people spend thousands...)
explore the pg dx which are free with bb/rb.
eg i often use the pg echo plug in on vocs a tad.
its very important to explore combos of different pg dx fx..
there are a ton of possibles...eg...
maybe you want a touch of reverb and chorus on a audio track.
you would be amazed what you can achieve with just the pg dx fx..
and some clever use of duplicating tracks and other tricks.
the trouble is most people want 'gimme now' fx and dont want to spend the time exploring how to use the pg dx fx.

imho if you cant do a hit with the pg low resource useage fx and the freebies at the following link (vst/vsti) then you wont with anything.
(some of the songs in my sig used just pg dx fx eg 'pretty girl' about my lovely wife. (mixed for good earbuds.))
ive had no complaints from listeners.
check the freebies out...some of which emulate offboard studio gear that used to cost BIG MONEY...thousands when i was recording in
big studios...here are some freebies out of zillions.

https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=813558#Post813558

finally because there are a zillion plugins out there...free and paid.
be carefull 'plugin chaseing'...because it can take sooo much time and there are sooo many choices that one never gets a song finished.
(been there done that.)
ive seen this many times in the past with people.

anyways...hth.

om

my songs....mixed for good earbuds...(fyi..my vocs on all songs..)
https://soundcloud.com/alfsongs
(90 songs created useing bb/rb)
(lots of tips of mine in pg tips forum.)