Generally short tube reservoirs and some small form reservoirs are difficult when you have high flow rate for number of reasons one of them being that the turbulence may force air bubbles to form and enter the system. Most modern reservoirs have some kind of brake or anti turbulence gizmos that allow for smaller size.
Bigger tube reservoirs are easier to maintain and set up, and you wont run into problems with them.
You should choose your reservoir depending of the amount of time and effort you want to put into setting up your loop and maintaining it. Then there is the practicality and aesthetics to consider.
Balance it all out to what you feel comfortable with.
I prefer medium sized tube reservoir myself simply because its so much easier to set up and maintain.
Micro and small reservoirs on the other hand are easy to place internally but it can become frustrating endurance battle to prime and bleed the system and maintenance may be tricky.
If you plan your loop right with drains and bleeding thought out you can make your life hell of a lot easier with most small reservoirs.
For ease of use and budget in mind you want to have medium sized tube res, or a small one that has top inlet with extension tube to stop any vortex/turbulence effects.
There are other options like the integrated pump top/tank combos that work well too but you should research them before buying one.