A basic setup would be as follows.... and would work with both the HX Effects or the Stomp.
Guitar > HX Input > "Some Effects" > Loop Send on HX to Amp Input > Amp Send to Loop Return on HX > IR > Output to PA
(note: it can get a lot more complex than this... and there are more options. I'm just trying to keep it simple for this example)
STOMP PRO's (HX Effects Cons)
You have an Audio Interface should you ever need it
You have amp modelling in case you decide to stop using an amp in the future.... or to provide more options immediately
The amp modelling can be used for headphone practice
STOMP CONS (HX Effects Pros)
You will have a limited number of effects to work with. With a mandatory loop and IR (for your setup) you are already down to 4 effects. If you add an amp you drop down to 3, etc...
You have less foot control over your effects... but since they are limited in number that won't matter so much
The bottom line....
If you have your heart set on amp modelling, whether now or later. go with a Stomp
If you intend to use your amp live... the HX Effects provides better options in regards to "number of effects" within a preset.
Only you can decide which is better for you.