Wherever you think you'll make the most money.... Depends on many many things, including but not limited to;
Permeability, heterogeneity/continuity, pressure, mobility ratio of your fluids, relief, aquifer strength and direction, assumptions of product price over time, corporate discount rates, projected OPEX and CAPEX for the various scenarios, logistical constraints... to name but a few.
Optimal field development is a very complex and highly interdependent problem - If you are new to it, start with an analog development plan to your field, work out the NPV, then play what-if's - what if you drilled double the well density? Half the well density? Different locations? Different artificial lift methods? Different well geometry? Different development plan (ie liquids stripping first then gas production, primary production followed by injection) etc etc... NPV/IRR out all the various scenarios, factor in other issues such as capital/liquidity constraints over time and risk and you'll start to come closer to understanding what your best plan may be.....
To cut a long story short - don't fixate on well spacing in isolation... it has knock-on effects
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