More detail
The choice mostly comes down to scale and how you trade. A low-volume service business has different needs from a busy shop running many invoices a day through a till.
Rather than memorise option names that KRA may revise, focus on the question that matters: do you need simple standalone invoicing, or invoicing built into a system that also runs your shop? The second is where an integrated, eTIMS-ready point of sale fits.
Related questions
Which eTIMS option is best for a shop with a till?
Which is best for a small service business?
Veira gives Kenyan shops one calm app for selling, M-Pesa, KRA eTIMS and stock, with a free terminal. Book a demo and see it set up for your trade.