I’m new to ArduPilot myself. I have a couple Freeman 2100 kits ordered but the main reason I selected those was I liked the Believer airplane the Freeman aircraft is based on. I have an Orange Cube in the mail myself but I don’t have any experience using one yet.
The links I provided earlier are the best sources of information of which I’m aware.
Deciding which aircraft to use will likely depend on how fast you need it and where it is available. I was able to order a MFE Fighter 4+1 from the USA Banggood warehouse and it arrived 3 days later. As you are likely aware, orders from China can take a couple of months if you don’t pay for fast shipping.
So far, I’ve only ordered MFE frames but I know FoxTech is another source of VTOL aircraft They have at least one tilt rotor aircraft. The Nimbus is their tilt rotor aircraft I’ve heard about. I think FoxTech sells complete systems with all the gear already installed and configured. These systems cost much more than if a person were to build the aircraft themselves.
I’m not recommending FoxTech and I’m not saying FoxTech is bad. I don’t know. I’m just sharing what little I know about this topic.