The "plugger" I use for maintenance of my lawn and grassy areas as mentioned above.
The plugger in my opinion is for maintenance primarily by reducing soil compaction, allowing the soil to breath, allows fertilizer to penetrate when applied, allows for better drainage if needed.
We drive a lot on our grass so it becomes compacted easily, not so much in the yard close to house but everywhere else. Around the barns, garden, chicken pens, fruit orchard, etc.
I do have some areas the water will stand it seems to help there as well.
I use mine 3 to 4 times a year in those high traffic areas.
I think the spike will do fine for you to start with. Level area you plan to plant grass on. Broadcast your seed and fertilizer, drag with a piece of chain link fence if you have one then cultipack with the spike aerator. This will allow good seed to soil contact. Water is the key after planting!
A soil test is recommended as well, if the ph is off it will prevent your grass from thriving. Adding lime to correct ph takes months for the change to occur but the sooner you start the better.
If no time to test soil your local ag sales aupplier can recommend a rate you could apply for your soil type in the area.
Best of luck
Jay