Poisson vs. Logistic regression

data melanoma;
      input age $ region $ cases total;
      ltotal=log(total);
      datalines;
   35-44 south 75  220407
   45-54 south 68  198119
   55-64 south 63  134084
   65-74 south 45   70708
   75+   south 27   34233
   <35   south 64 1074246
   35-44 north 76  564535
   45-54 north 98  592983
   55-64 north 104 450740
   65-74 north 63  270908
   75+   north 80  161850
   <35   north 61 2880262
   ;
proc genmod data=melanoma order=data;
  class age region;
  model cases = age region / dist=poisson link=log offset=ltotal;
run;

proc sql;
  create table melanoma2 as
  select age, region, 1 as resp, cases as count  from melanoma union
  select age, region, 0 as resp, total-cases as count  from melanoma 
;quit;

proc genmod data=melanoma2;
  weight count;
  class age region;
  model resp=age region / dist=binomial link=logit;
run;