It depends on what you mean by invocation and evocation. I have seen certain rituals that are named as invocations which have the purpose of taking on the qualities of the spirits being invoked. That is the result being sought - to take on qualities, not any external manifestations.
In my experience, it doesn’t matter what method you use, if you connect with a spirit intentionally for magickal purposes, you will take on its powers and qualities. If you evoke demons, you will take on their powers and qualities. I have yet to experience any demon, even the darkest, most baneful of demons, that is more vile than many human beings I have personally known. Maybe, maybe if you banish and banish and put up protections and walls you could avoid this, but then why are you even summoning a demon? Why not work with an angel instead, which is supposedly safer than a demon? On that note - not even in baneful terms, many angels can genuinely cause insanity and permanent mental health damage to one who is not prepared or does not have the psychological skills to handle the energy. If “fuck yeah” is your response, you are either ignorant beyond your awareness and will get fucked up bad, or you are ready. I say that with no sense of joking or bravado. Magick is real.
Evocation is good for a stronger connection to the spirit being evoked, be it a demon or an archangel. Simple sigil magick usually does not yield the same degree of immediate experience of the spirit being present with you. If you want that level of experience, evocation is one way to achieve that. I would say that Pathworking (mental journeying) is another method.
I am of the belief that for most all practical results, simple sigil magick is effective, or invocations for results if you want to use that term. You can do a 2 minute ritual and get very fine and profound results.
More advanced methods such as full evocations, highly rich in sensory detail Pathworkings, and dream methods require more practice and cultivation, but offer experiences that are certainly more supernatural. If you want to evoke as a complete beginner, have at it, but just realize that practice is needed to develop occult skills that may not always be strictly practical in nature. There is no reason to get obsessed about having conversations with demons as that will do little good. Evoking for results that you want to manifest in your life is the more effective approach.
I feel that it is worth noting a less commonly known method - Enochian Loagaeth tables, which I have shared a method for in the thread I post in. I have little experience with this magick, but what experience I do have has made me come to believe that these tables are perhaps one of the most effective ways to achieve externally visible forms of spirits in the space around you. I experienced this relatively frequently with great clarity while involved with the tables. I have seen spirits manifested before, but not as regularly, as long, or as clearly as with these energies. The magick doesn’t seem to be the most practical in the sense of material results, but if what you want is extraordinarily mystical experiences, and you are willing to do supporting practices like meditation, energy work, and dream yoga, this is the method I would use.