The reason you can correct more often with the pump (or you can try to) is that the pump keeps track of the corrections and won't let you stack. If you try to correct, it will tell you the amount you can, or tell you that you shouldn't. Though the pump is more convenient, what I feel is best about it is that you are able to vary your basal rates to cover the way your body works...and to adjust to different activity levels on any specific day. With Lantus, one has to consume more carbs in order to do certain activities. With the pump, one can lower the basal rate an hour or so ahead of time and for an extended period. Or, one can disconnect altogether and receive no basal insulin for a time. On the flip side, one can increase the basal rate if one is sick or has ketones...or is having a hard time lowering a high for any reason.