Just some comments
If mains power is available, studio heads win every time. They have modelling lamps so you can see exactly what's happening to the light, you will learn more, far more quickly. They recycle fast and will run all day without overheating, there is a huge range of light modifiers available for them (they're what makes the light, not the flash unit), and they're not expensive (much cheaper than Canon RT system). Studio heads are also more powerful, though that's not always needed. You can mix studio heads with speedlites.
With speedlite triggers, the key decision is auto-TTL vs manual exposure control (cheaper). The main benefit of auto-TTL is speed of use, when you need good exposure straight off the bat, such as fast moving social situations where distance is changing all the time. Flash exposure is very sensitive to distance. Speedlites can also do HSS (high speed sync) that's very handy outdoors.
Almost by definition, remote flash work of any kind is fairly static in terms of exposure because the lights are fixed in position. So auto-TTL is much less beneficial and can even work against you, so manual control is usually the favoured option.
Most radio triggers are brand-specific, except the really basic ones that have just one central firing pin. PW Plus triggers are basic in that respect, though relatively expensive. Their main advantage is reverse compatibility with all PW triggers going back many years (same radio frequency).
The popular option today is Yongnuo 622 auto-TTL triggers, fully featured, very versatile (can also do remote second-curtain sync, that the Canon RT cannot) and great value. Several of other options available.
