The eternal safety v decocker debate for carry is not really relevant here since the OP stated that he had no intention of carrying an SP-01 but wanted it for range use. After all the safety or decocker is only necessary when holstering. It really depends on how he wants to shoot.
Background: I own an SP-01 Tactical (decocker) with approximately 3000 rounds that I shoot at my range and in my local 2 gun match. The only modifications I've done to the pistol are 15lb Cajun Gunworks mainspring, Cajun Gunworks Dawson fiber optic front sight, and Mec-Gar 17 round magazines with +2 base plates.
As I see it, for range use, there are advantages and disadvantages with each:
For safety only:
You potentially get a slightly better trigger out the box. Keep in mind that some individual pistols might have slightly nicer triggers than others. To properly judge a trigger before I consider any gunsmithing, I find it useful to put 500 rounds through the pistol which is a proper amount to get used to any new platform anyway.
The 75s and SP-01s with safeties seem to get a bit more "bang for your buck" when given proper trigger jobs. While the decockers also feel better, the improvements aren't quite as dramatic in my experience. That being said my SP-01 Tactical has a pretty nice broken-in trigger. Nice enough that I've never really considered a trigger job.
For decocker:
If you don't have much experience with DA/SA and want to gain proficiency, I find it useful to have a decocker since it's easy to practice transitions without having to manually drop the hammer on a loaded chamber. I know at least two people who also own SP-01s with safeties and they really don't have that experience in DA since they shoot the pistol in single action only.
If you ever wanted to get into local level matches (which I always recommend), it might be better to get the Tactical model. I'm by no means some expert, but I began shooting at a local match because I enjoy it and it makes me a better shooter. Even unmodified, an SP-01 is a great entry-level competition pistol. Now my local 2 gun match (pistol+carbine) is independent and thus you could run a safety only SP-01 cocked and locked if you wanted to. However, USPSA/IPSC (Production division), IDPA (Stock Service Pistol division), and some steel matches require all DA capable pistols to be shot from double action. Thus you have to manually decock on a loaded chamber pointed at at the berm when you make ready. If you happen to have a discharge (ND) you are disqualified (DQ). I personally saw this happen as a spectator at a local USPSA match with an individual who was relatively new to competition shooting with a Shadow 2 (they only come with safeties).
Ask yourself these questions:
Do you have experience and like single action only pistols (1911s)? - If yes, than safety.
Do you require the best trigger mechanically possible? If so, are you willing to spend the money to get it? Keep in mind that as nice as the SP-01 triggers can be, they will never be as crisp as a single-action-only because of the firing pin safety. - If yes, than safety.
Do you ever plan on holstering and drawing the pistol and want DA (for home defense for example). Or need proficiency in practicing different pulls of DA/SA? - If yes, than Tactical.
Do you ever plan on someday using your SP-01 in a match and you don't have much experience manually decocking? - If yes, than Tactical.
This is not exhaustive. Just a few questions to ask yourself what you want to do with the SP-01.
In conclusion: I guess for just range use it probably doesn't matter all that much in the greater scheme of things. After all, most ranges do not allow for holstering and drawing pistols anyway so it is possible to shoot thousands of rounds through an SP-01 from the bench in single action without either engaging a safety or decocking.
